28451020 has 48 divisors (see below), whose sum is σ = 65268000. Its totient is φ = 10354176.

The previous prime is 28451011. The next prime is 28451021. The reversal of 28451020 is 2015482.

It is a junction number, because it is equal to n+sod(n) for n = 28450982 and 28451000.

It is not an unprimeable number, because it can be changed into a prime (28451021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18231 + ... + 19729.

It is an arithmetic number, because the mean of its divisors is an integer number (1359750).

Almost surely, 2^28451020 is an apocalyptic number.

28451020 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 28451020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32634000).

28451020 is an abundant number, since it is smaller than the sum of its proper divisors (36816980).

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

28451020 is a wasteful number, since it uses less digits than its factorization.

28451020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1594 (or 1592 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 28451020 is about 5333.9497560438. The cubic root of 28451020 is about 305.2806518230.

The spelling of 28451020 in words is "twenty-eight million, four hundred fifty-one thousand, twenty".