28664404 has 12 divisors (see below), whose sum is σ = 50869728. Its totient is φ = 14130200.

The previous prime is 28664401. The next prime is 28664413. The reversal of 28664404 is 40446682.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28664404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28664401) 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, 50182 + ... + 50749.

It is an arithmetic number, because the mean of its divisors is an integer number (4239144).

Almost surely, 2^28664404 is an apocalyptic number.

It is an amenable number.

28664404 is a deficient number, since it is larger than the sum of its proper divisors (22205324).

28664404 is a wasteful number, since it uses less digits than its factorization.

28664404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101006 (or 101004 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 34.

The square root of 28664404 is about 5353.9148293562. The cubic root of 28664404 is about 306.0419581635.

The spelling of 28664404 in words is "twenty-eight million, six hundred sixty-four thousand, four hundred four".