28025928 has 96 divisors (see below), whose sum is σ = 91877760. Its totient is φ = 7534080.

The previous prime is 28025927. The next prime is 28025929. The reversal of 28025928 is 82952082.

It is an interprime number because it is at equal distance from previous prime (28025927) and next prime (28025929).

It is a super-2 number, since 2×28025928² = 1570905280522368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28025892 and 28025901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28025927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6933 + ... + 10203.

It is an arithmetic number, because the mean of its divisors is an integer number (957060).

Almost surely, 2^28025928 is an apocalyptic number.

28025928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28025928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45938880).

28025928 is an abundant number, since it is smaller than the sum of its proper divisors (63851832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28025928 is a wasteful number, since it uses less digits than its factorization.

28025928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3307 (or 3300 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28025928 is about 5293.9520209386. The cubic root of 28025928 is about 303.7525976509.

The spelling of 28025928 in words is "twenty-eight million, twenty-five thousand, nine hundred twenty-eight".