28531664 has 20 divisors (see below), whose sum is σ = 63177504. Its totient is φ = 12227808.

The previous prime is 28531651. The next prime is 28531667. The reversal of 28531664 is 46613582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28531667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127262 + ... + 127485.

Almost surely, 2^28531664 is an apocalyptic number.

It is an amenable number.

28531664 is an abundant number, since it is smaller than the sum of its proper divisors (34645840).

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

28531664 is a wasteful number, since it uses less digits than its factorization.

28531664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254762 (or 254756 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 28531664 is about 5341.5039080768. The cubic root of 28531664 is about 305.5688175744.

The spelling of 28531664 in words is "twenty-eight million, five hundred thirty-one thousand, six hundred sixty-four".