28750664 has 8 divisors (see below), whose sum is σ = 53907510. Its totient is φ = 14375328.

The previous prime is 28750663. The next prime is 28750679. The reversal of 28750664 is 46605782.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 28622500 + 128164 = 5350^2 + 358^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (28750663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1796909 + ... + 1796924.

Almost surely, 2^28750664 is an apocalyptic number.

It is an amenable number.

28750664 is a deficient number, since it is larger than the sum of its proper divisors (25156846).

28750664 is a wasteful number, since it uses less digits than its factorization.

28750664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3593839 (or 3593835 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 28750664 is about 5361.9645653436. The cubic root of 28750664 is about 306.3486421657.

The spelling of 28750664 in words is "twenty-eight million, seven hundred fifty thousand, six hundred sixty-four".