28665656 has 8 divisors (see below), whose sum is σ = 53748120. Its totient is φ = 14332824.

The previous prime is 28665647. The next prime is 28665671. The reversal of 28665656 is 65656682.

28665656 = 1331² + 1332² + ... + 1346².

It is a happy number.

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

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, 1791596 + ... + 1791611.

It is an arithmetic number, because the mean of its divisors is an integer number (6718515).

Almost surely, 2^28665656 is an apocalyptic number.

It is an amenable number.

28665656 is a deficient number, since it is larger than the sum of its proper divisors (25082464).

28665656 is a wasteful number, since it uses less digits than its factorization.

28665656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3583213 (or 3583209 counting only the distinct ones).

The product of its digits is 518400, while the sum is 44.

The square root of 28665656 is about 5354.0317518670. The cubic root of 28665656 is about 306.0464138519.

The spelling of 28665656 in words is "twenty-eight million, six hundred sixty-five thousand, six hundred fifty-six".