28615668 has 48 divisors (see below), whose sum is σ = 68947200. Its totient is φ = 9232384.

The previous prime is 28615619. The next prime is 28615673. The reversal of 28615668 is 86651682.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63508 + ... + 63956.

It is an arithmetic number, because the mean of its divisors is an integer number (1436400).

Almost surely, 2^28615668 is an apocalyptic number.

It is an amenable number.

28615668 is an abundant number, since it is smaller than the sum of its proper divisors (40331532).

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

28615668 is a wasteful number, since it uses less digits than its factorization.

28615668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616 (or 614 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The square root of 28615668 is about 5349.3614572209. The cubic root of 28615668 is about 305.8684128146.

The spelling of 28615668 in words is "twenty-eight million, six hundred fifteen thousand, six hundred sixty-eight".