28615920 has 40 divisors (see below), whose sum is σ = 88710096. Its totient is φ = 7630848.

The previous prime is 28615877. The next prime is 28615931. The reversal of 28615920 is 2951682.

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

It is a congruent number.

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, 59377 + ... + 59856.

Almost surely, 2^28615920 is an apocalyptic number.

28615920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28615920 is an abundant number, since it is smaller than the sum of its proper divisors (60094176).

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

28615920 is a wasteful number, since it uses less digits than its factorization.

28615920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119249 (or 119243 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 28615920 is about 5349.3850113821. The cubic root of 28615920 is about 305.8693106749.

The spelling of 28615920 in words is "twenty-eight million, six hundred fifteen thousand, nine hundred twenty".