28580520 has 32 divisors (see below), whose sum is σ = 85741920. Its totient is φ = 7621440.

The previous prime is 28580507. The next prime is 28580533. The reversal of 28580520 is 2508582.

It is an interprime number because it is at equal distance from previous prime (28580507) and next prime (28580533).

It is a super-2 number, since 2×28580520² = 1633692246940800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118966 + ... + 119205.

It is an arithmetic number, because the mean of its divisors is an integer number (2679435).

Almost surely, 2^28580520 is an apocalyptic number.

28580520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28580520 is an abundant number, since it is smaller than the sum of its proper divisors (57161400).

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

28580520 is a wasteful number, since it uses less digits than its factorization.

28580520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238185 (or 238181 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 28580520 is about 5346.0751958797. The cubic root of 28580520 is about 305.7431310100.

The spelling of 28580520 in words is "twenty-eight million, five hundred eighty thousand, five hundred twenty".