28651564 has 24 divisors (see below), whose sum is σ = 52035200. Its totient is φ = 13789440.

The previous prime is 28651561. The next prime is 28651577. The reversal of 28651564 is 46515682.

It is not an unprimeable number, because it can be changed into a prime (28651561) 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 7 ways as a sum of consecutive naturals, for example, 27892 + ... + 28900.

Almost surely, 2^28651564 is an apocalyptic number.

It is an amenable number.

28651564 is a deficient number, since it is larger than the sum of its proper divisors (23383636).

28651564 is a wasteful number, since it uses less digits than its factorization.

28651564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273 (or 1271 counting only the distinct ones).

The product of its digits is 57600, while the sum is 37.

The square root of 28651564 is about 5352.7155724922. The cubic root of 28651564 is about 305.9962549558.

The spelling of 28651564 in words is "twenty-eight million, six hundred fifty-one thousand, five hundred sixty-four".