28475920 has 40 divisors (see below), whose sum is σ = 72227520. Its totient is φ = 10354560.

The previous prime is 28475917. The next prime is 28475963. The reversal of 28475920 is 2957482.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28475920.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15300 + ... + 17059.

It is an arithmetic number, because the mean of its divisors is an integer number (1805688).

Almost surely, 2^28475920 is an apocalyptic number.

28475920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28475920 is an abundant number, since it is smaller than the sum of its proper divisors (43751600).

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

28475920 is a wasteful number, since it uses less digits than its factorization.

28475920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32383 (or 32377 counting only the distinct ones).

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

The square root of 28475920 is about 5336.2833507976. The cubic root of 28475920 is about 305.3696852066.

The spelling of 28475920 in words is "twenty-eight million, four hundred seventy-five thousand, nine hundred twenty".