28915920 has 160 divisors (see below), whose sum is σ = 108743040. Its totient is φ = 7004160.

The previous prime is 28915919. The next prime is 28915933. The reversal of 28915920 is 2951982.

It is a super-2 number, since 2×28915920² = 1672260858892800, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23152 + ... + 24368.

It is an arithmetic number, because the mean of its divisors is an integer number (679644).

Almost surely, 2^28915920 is an apocalyptic number.

28915920 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 28915920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54371520).

28915920 is an abundant number, since it is smaller than the sum of its proper divisors (79827120).

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

28915920 is a wasteful number, since it uses less digits than its factorization.

28915920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250 (or 1238 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 28915920 is about 5377.3525084376. The cubic root of 28915920 is about 306.9344751526.

The spelling of 28915920 in words is "twenty-eight million, nine hundred fifteen thousand, nine hundred twenty".