28574920 has 64 divisors (see below), whose sum is σ = 70943040. Its totient is φ = 10272000.

The previous prime is 28574893. The next prime is 28574957. The reversal of 28574920 is 2947582.

It is a self number, because there is not a number n which added to its sum of digits gives 28574920.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44119 + ... + 44761.

It is an arithmetic number, because the mean of its divisors is an integer number (1108485).

Almost surely, 2^28574920 is an apocalyptic number.

28574920 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 28574920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35471520).

28574920 is an abundant number, since it is smaller than the sum of its proper divisors (42368120).

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

28574920 is a wasteful number, since it uses less digits than its factorization.

28574920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766 (or 762 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 28574920 is about 5345.5514215093. The cubic root of 28574920 is about 305.7231608419.

It can be divided in two parts, 2857 and 4920, that added together give a palindrome (7777).

The spelling of 28574920 in words is "twenty-eight million, five hundred seventy-four thousand, nine hundred twenty".