28404664 has 16 divisors (see below), whose sum is σ = 53365320. Its totient is φ = 14173920.

The previous prime is 28404613. The next prime is 28404679. The reversal of 28404664 is 46640482.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1047 + ... + 7609.

Almost surely, 2^28404664 is an apocalyptic number.

It is an amenable number.

28404664 is a deficient number, since it is larger than the sum of its proper divisors (24960656).

28404664 is a wasteful number, since it uses less digits than its factorization.

28404664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7110 (or 7106 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 34.

The square root of 28404664 is about 5329.6026118276. The cubic root of 28404664 is about 305.1147610780.

The spelling of 28404664 in words is "twenty-eight million, four hundred four thousand, six hundred sixty-four".