28956657 has 8 divisors (see below), whose sum is σ = 38633760. Its totient is φ = 19292000.

The previous prime is 28956647. The next prime is 28956679. The reversal of 28956657 is 75665982.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28956657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28956617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7282 + ... + 10532.

It is an arithmetic number, because the mean of its divisors is an integer number (4829220).

Almost surely, 2^28956657 is an apocalyptic number.

It is an amenable number.

28956657 is a deficient number, since it is larger than the sum of its proper divisors (9677103).

28956657 is a wasteful number, since it uses less digits than its factorization.

28956657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6223.

The product of its digits is 907200, while the sum is 48.

The square root of 28956657 is about 5381.1390058240. The cubic root of 28956657 is about 307.0785448390.

The spelling of 28956657 in words is "twenty-eight million, nine hundred fifty-six thousand, six hundred fifty-seven".