28911664 has 20 divisors (see below), whose sum is σ = 56123640. Its totient is φ = 14428160.

The previous prime is 28911661. The next prime is 28911671. The reversal of 28911664 is 46611982.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28911661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8847 + ... + 11665.

It is an arithmetic number, because the mean of its divisors is an integer number (2806182).

Almost surely, 2^28911664 is an apocalyptic number.

It is an amenable number.

28911664 is a deficient number, since it is larger than the sum of its proper divisors (27211976).

28911664 is a wasteful number, since it uses less digits than its factorization.

28911664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3468 (or 3462 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 28911664 is about 5376.9567601014. The cubic root of 28911664 is about 306.9194156603.

It can be divided in two parts, 289116 and 64, that added together give a triangular number (289180 = T₇₆₀).

The spelling of 28911664 in words is "twenty-eight million, nine hundred eleven thousand, six hundred sixty-four".