28655520 has 48 divisors (see below), whose sum is σ = 90266400. Its totient is φ = 7641344.

The previous prime is 28655503. The next prime is 28655581. The reversal of 28655520 is 2555682.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×28655520² = 1642277652940800, which contains 22 as substring.

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, 29370 + ... + 30329.

It is an arithmetic number, because the mean of its divisors is an integer number (1880550).

Almost surely, 2^28655520 is an apocalyptic number.

28655520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28655520 is an abundant number, since it is smaller than the sum of its proper divisors (61610880).

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

28655520 is a wasteful number, since it uses less digits than its factorization.

28655520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59717 (or 59709 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 33.

The square root of 28655520 is about 5353.0850917952. The cubic root of 28655520 is about 306.0103375550.

It can be divided in two parts, 2865 and 5520, that added together give a triangular number (8385 = T₁₂₉).

The spelling of 28655520 in words is "twenty-eight million, six hundred fifty-five thousand, five hundred twenty".