28637564 has 12 divisors (see below), whose sum is σ = 50332464. Its totient is φ = 14256864.

The previous prime is 28637561. The next prime is 28637569. The reversal of 28637564 is 46573682.

It is a happy number.

It is a super-2 number, since 2×28637564² = 1640220143708192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28637561) 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, 14432 + ... + 16295.

It is an arithmetic number, because the mean of its divisors is an integer number (4194372).

Almost surely, 2^28637564 is an apocalyptic number.

It is an amenable number.

28637564 is a deficient number, since it is larger than the sum of its proper divisors (21694900).

28637564 is a wasteful number, since it uses less digits than its factorization.

28637564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30964 (or 30962 counting only the distinct ones).

The product of its digits is 241920, while the sum is 41.

The square root of 28637564 is about 5351.4076652784. The cubic root of 28637564 is about 305.9464072347.

The spelling of 28637564 in words is "twenty-eight million, six hundred thirty-seven thousand, five hundred sixty-four".