28517538 has 16 divisors (see below), whose sum is σ = 65183040. Its totient is φ = 8147856.

The previous prime is 28517519. The next prime is 28517543. The reversal of 28517538 is 83571582.

It is a junction number, because it is equal to n+sod(n) for n = 28517496 and 28517505.

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, 339453 + ... + 339536.

It is an arithmetic number, because the mean of its divisors is an integer number (4073940).

Almost surely, 2^28517538 is an apocalyptic number.

28517538 is an abundant number, since it is smaller than the sum of its proper divisors (36665502).

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

28517538 is a wasteful number, since it uses less digits than its factorization.

28517538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679001.

The product of its digits is 67200, while the sum is 39.

The square root of 28517538 is about 5340.1814575911. The cubic root of 28517538 is about 305.5183803049.

The spelling of 28517538 in words is "twenty-eight million, five hundred seventeen thousand, five hundred thirty-eight".