28975920 has 80 divisors (see below), whose sum is σ = 90515040. Its totient is φ = 7667712.

The previous prime is 28975913. The next prime is 28975957. The reversal of 28975920 is 2957982.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 37296 + ... + 38064.

It is an arithmetic number, because the mean of its divisors is an integer number (1131438).

Almost surely, 2^28975920 is an apocalyptic number.

28975920 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 28975920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45257520).

28975920 is an abundant number, since it is smaller than the sum of its proper divisors (61539120).

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

28975920 is a wasteful number, since it uses less digits than its factorization.

28975920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942 (or 936 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 28975920 is about 5382.9285709547. The cubic root of 28975920 is about 307.1466229418.

The spelling of 28975920 in words is "twenty-eight million, nine hundred seventy-five thousand, nine hundred twenty".