28029920 has 48 divisors (see below), whose sum is σ = 66588480. Its totient is φ = 11149824.

The previous prime is 28029917. The next prime is 28029929. The reversal of 28029920 is 2992082.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28029929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37874 + ... + 38606.

It is an arithmetic number, because the mean of its divisors is an integer number (1387260).

Almost surely, 2^28029920 is an apocalyptic number.

28029920 is a gapful number since it is divisible by the number (20) 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 28029920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33294240).

28029920 is an abundant number, since it is smaller than the sum of its proper divisors (38558560).

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

28029920 is a wasteful number, since it uses less digits than its factorization.

28029920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987 (or 979 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 28029920 is about 5294.3290415311. The cubic root of 28029920 is about 303.7670190919.

The spelling of 28029920 in words is "twenty-eight million, twenty-nine thousand, nine hundred twenty".