28501564 has 24 divisors (see below), whose sum is σ = 61388768. Its totient is φ = 11275200.

The previous prime is 28501553. The next prime is 28501567. The reversal of 28501564 is 46510582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28501567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38787 + ... + 39514.

Almost surely, 2^28501564 is an apocalyptic number.

It is an amenable number.

28501564 is an abundant number, since it is smaller than the sum of its proper divisors (32887204).

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

28501564 is a wasteful number, since it uses less digits than its factorization.

28501564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78325 (or 78323 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 28501564 is about 5338.6856060270. The cubic root of 28501564 is about 305.4613246301.

The spelling of 28501564 in words is "twenty-eight million, five hundred one thousand, five hundred sixty-four".