28723664 has 10 divisors (see below), whose sum is σ = 55652130. Its totient is φ = 14361824.

The previous prime is 28723663. The next prime is 28723679. The reversal of 28723664 is 46632782.

It can be written as a sum of positive squares in only one way, i.e., 25806400 + 2917264 = 5080^2 + 1708^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28723663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 897599 + ... + 897630.

It is an arithmetic number, because the mean of its divisors is an integer number (5565213).

Almost surely, 2^28723664 is an apocalyptic number.

It is an amenable number.

28723664 is a deficient number, since it is larger than the sum of its proper divisors (26928466).

28723664 is a wasteful number, since it uses less digits than its factorization.

28723664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795237 (or 1795231 counting only the distinct ones).

The product of its digits is 96768, while the sum is 38.

The square root of 28723664 is about 5359.4462400513. The cubic root of 28723664 is about 306.2527139007.

The spelling of 28723664 in words is "twenty-eight million, seven hundred twenty-three thousand, six hundred sixty-four".