28572920 has 32 divisors (see below), whose sum is σ = 68072400. Its totient is φ = 10756608.

The previous prime is 28572893. The next prime is 28572953. The reversal of 28572920 is 2927582.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20330 + ... + 21689.

Almost surely, 2^28572920 is an apocalyptic number.

28572920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28572920 is an abundant number, since it is smaller than the sum of its proper divisors (39499480).

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

28572920 is a wasteful number, since it uses less digits than its factorization.

28572920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42047 (or 42043 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 28572920 is about 5345.3643467962. The cubic root of 28572920 is about 305.7160280067.

It can be divided in two parts, 28572 and 920, that added together give a palindrome (29492).

The spelling of 28572920 in words is "twenty-eight million, five hundred seventy-two thousand, nine hundred twenty".