28999664 has 20 divisors (see below), whose sum is σ = 56276160. Its totient is φ = 14476800.

The previous prime is 28999657. The next prime is 28999667. The reversal of 28999664 is 46699982.

It is a super-2 number, since 2×28999664² = 1681961024225792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28999667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13889 + ... + 15839.

It is an arithmetic number, because the mean of its divisors is an integer number (2813808).

Almost surely, 2^28999664 is an apocalyptic number.

It is an amenable number.

28999664 is a deficient number, since it is larger than the sum of its proper divisors (27276496).

28999664 is a wasteful number, since it uses less digits than its factorization.

28999664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2888 (or 2882 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 53.

The square root of 28999664 is about 5385.1336102273. The cubic root of 28999664 is about 307.2304960141.

The spelling of 28999664 in words is "twenty-eight million, nine hundred ninety-nine thousand, six hundred sixty-four".