28684679628 has 36 divisors (see below), whose sum is σ = 73568699960. Its totient is φ = 8692326720.

The previous prime is 28684679627. The next prime is 28684679789. The reversal of 28684679628 is 82697648682.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is not an unprimeable number, because it can be changed into a prime (28684679627) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9876193 + ... + 9879096.

Almost surely, 2^28684679628 is an apocalyptic number.

It is an amenable number.

28684679628 is an abundant number, since it is smaller than the sum of its proper divisors (44884020332).

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

28684679628 is a wasteful number, since it uses less digits than its factorization.

28684679628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19755318 (or 19755305 counting only the distinct ones).

The product of its digits is 111476736, while the sum is 66.

The spelling of 28684679628 in words is "twenty-eight billion, six hundred eighty-four million, six hundred seventy-nine thousand, six hundred twenty-eight".