28638164 has 6 divisors (see below), whose sum is σ = 50116794. Its totient is φ = 14319080.

The previous prime is 28638157. The next prime is 28638173. The reversal of 28638164 is 46183682.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 25603600 + 3034564 = 5060^2 + 1742^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3579767 + ... + 3579774.

It is an arithmetic number, because the mean of its divisors is an integer number (8352799).

Almost surely, 2^28638164 is an apocalyptic number.

It is an amenable number.

28638164 is a deficient number, since it is larger than the sum of its proper divisors (21478630).

28638164 is a wasteful number, since it uses less digits than its factorization.

28638164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7159545 (or 7159543 counting only the distinct ones).

The product of its digits is 55296, while the sum is 38.

The square root of 28638164 is about 5351.4637250009. The cubic root of 28638164 is about 305.9485438988.

The spelling of 28638164 in words is "twenty-eight million, six hundred thirty-eight thousand, one hundred sixty-four".