28688764 has 54 divisors (see below), whose sum is σ = 57675744. Its totient is φ = 12467520.

The previous prime is 28688761. The next prime is 28688789. The reversal of 28688764 is 46788682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28688761) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 775354 + ... + 775390.

Almost surely, 2^28688764 is an apocalyptic number.

It is an amenable number.

28688764 is an abundant number, since it is smaller than the sum of its proper divisors (28986980).

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

28688764 is a wasteful number, since it uses less digits than its factorization.

28688764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 83 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 49.

The square root of 28688764 is about 5356.1893170425. The cubic root of 28688764 is about 306.1286286231.

The spelling of 28688764 in words is "twenty-eight million, six hundred eighty-eight thousand, seven hundred sixty-four".