28678764 has 24 divisors (see below), whose sum is σ = 68474560. Its totient is φ = 9337104.

The previous prime is 28678763. The next prime is 28678781. The reversal of 28678764 is 46787682.

It is not an unprimeable number, because it can be changed into a prime (28678763) 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, 27274 + ... + 28305.

Almost surely, 2^28678764 is an apocalyptic number.

It is an amenable number.

28678764 is an abundant number, since it is smaller than the sum of its proper divisors (39795796).

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

28678764 is a wasteful number, since it uses less digits than its factorization.

28678764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55629 (or 55627 counting only the distinct ones).

The product of its digits is 903168, while the sum is 48.

The square root of 28678764 is about 5355.2557361904. The cubic root of 28678764 is about 306.0930555553.

The spelling of 28678764 in words is "twenty-eight million, six hundred seventy-eight thousand, seven hundred sixty-four".