28726664 has 8 divisors (see below), whose sum is σ = 53862510. Its totient is φ = 14363328.

The previous prime is 28726661. The next prime is 28726667. The reversal of 28726664 is 46662782.

It is an interprime number because it is at equal distance from previous prime (28726661) and next prime (28726667).

It can be written as a sum of positive squares in only one way, i.e., 27144100 + 1582564 = 5210^2 + 1258^2 .

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 (28726661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1795409 + ... + 1795424.

Almost surely, 2^28726664 is an apocalyptic number.

It is an amenable number.

28726664 is a deficient number, since it is larger than the sum of its proper divisors (25135846).

28726664 is a wasteful number, since it uses less digits than its factorization.

28726664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3590839 (or 3590835 counting only the distinct ones).

The product of its digits is 193536, while the sum is 41.

The square root of 28726664 is about 5359.7261124054. The cubic root of 28726664 is about 306.2633755646.

The spelling of 28726664 in words is "twenty-eight million, seven hundred twenty-six thousand, six hundred sixty-four".