28575920 has 20 divisors (see below), whose sum is σ = 66439200. Its totient is φ = 11430336.

The previous prime is 28575919. The next prime is 28575931. The reversal of 28575920 is 2957582.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178520 + ... + 178679.

It is an arithmetic number, because the mean of its divisors is an integer number (3321960).

Almost surely, 2^28575920 is an apocalyptic number.

28575920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28575920 is an abundant number, since it is smaller than the sum of its proper divisors (37863280).

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

28575920 is a wasteful number, since it uses less digits than its factorization.

28575920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357212 (or 357206 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 28575920 is about 5345.6449564108. The cubic root of 28575920 is about 305.7267271347.

The spelling of 28575920 in words is "twenty-eight million, five hundred seventy-five thousand, nine hundred twenty".