28638956 has 12 divisors (see below), whose sum is σ = 52297392. Its totient is φ = 13696848.

The previous prime is 28638941. The next prime is 28638971. The reversal of 28638956 is 65983682.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28638941) and next prime (28638971).

It is a self number, because there is not a number n which added to its sum of digits gives 28638956.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 155555 + ... + 155738.

It is an arithmetic number, because the mean of its divisors is an integer number (4358116).

Almost surely, 2^28638956 is an apocalyptic number.

It is an amenable number.

28638956 is a deficient number, since it is larger than the sum of its proper divisors (23658436).

28638956 is a wasteful number, since it uses less digits than its factorization.

28638956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311320 (or 311318 counting only the distinct ones).

The product of its digits is 622080, while the sum is 47.

The square root of 28638956 is about 5351.5377229353. The cubic root of 28638956 is about 305.9513642497.

The spelling of 28638956 in words is "twenty-eight million, six hundred thirty-eight thousand, nine hundred fifty-six".