28578520 has 16 divisors (see below), whose sum is σ = 64301760. Its totient is φ = 11431392.

The previous prime is 28578509. The next prime is 28578521. The reversal of 28578520 is 2587582.

It is a self number, because there is not a number n which added to its sum of digits gives 28578520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28578521) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 357192 + ... + 357271.

It is an arithmetic number, because the mean of its divisors is an integer number (4018860).

Almost surely, 2^28578520 is an apocalyptic number.

28578520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28578520 is an abundant number, since it is smaller than the sum of its proper divisors (35723240).

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

28578520 is a wasteful number, since it uses less digits than its factorization.

28578520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714474 (or 714470 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 37.

The square root of 28578520 is about 5345.8881394956. Note that the first 3 decimals coincide. The cubic root of 28578520 is about 305.7359991066.

The spelling of 28578520 in words is "twenty-eight million, five hundred seventy-eight thousand, five hundred twenty".