28317870 has 64 divisors (see below), whose sum is σ = 86307840. Its totient is φ = 6472224.

The previous prime is 28317823. The next prime is 28317881. The reversal of 28317870 is 7871382.

It is a super-2 number, since 2×28317870² = 1603803522673800, which contains 22 as substring.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 5602 + ... + 9381.

It is an arithmetic number, because the mean of its divisors is an integer number (1348560).

Almost surely, 2^28317870 is an apocalyptic number.

28317870 is an abundant number, since it is smaller than the sum of its proper divisors (57989970).

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

28317870 is a wasteful number, since it uses less digits than its factorization.

28317870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15006 (or 15000 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 28317870 is about 5321.4537487420. The cubic root of 28317870 is about 304.8036719131.

It can be divided in two parts, 2831 and 7870, that added together give a palindrome (10701).

The spelling of 28317870 in words is "twenty-eight million, three hundred seventeen thousand, eight hundred seventy".