28656474 has 48 divisors (see below), whose sum is σ = 72739296. Its totient is φ = 7442400.

The previous prime is 28656469. The next prime is 28656479. The reversal of 28656474 is 47465682.

It is an interprime number because it is at equal distance from previous prime (28656469) and next prime (28656479).

It is a super-2 number, since 2×28656474² = 1642387004225352, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (28656479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1197 + ... + 7664.

It is an arithmetic number, because the mean of its divisors is an integer number (1515402).

Almost surely, 2^28656474 is an apocalyptic number.

28656474 is an abundant number, since it is smaller than the sum of its proper divisors (44082822).

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

28656474 is a wasteful number, since it uses less digits than its factorization.

28656474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8891 (or 8884 counting only the distinct ones).

The product of its digits is 322560, while the sum is 42.

The square root of 28656474 is about 5353.1741985480. The cubic root of 28656474 is about 306.0137334175.

It can be divided in two parts, 2865 and 6474, that added together give a palindrome (9339).

The spelling of 28656474 in words is "twenty-eight million, six hundred fifty-six thousand, four hundred seventy-four".