28756422 has 48 divisors (see below), whose sum is σ = 65050128. Its totient is φ = 9172800.

The previous prime is 28756391. The next prime is 28756447. The reversal of 28756422 is 22465782.

28756422 is a `hidden beast` number, since 2 + 8 + 7 + 5 + 642 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40672 + ... + 41372.

It is an arithmetic number, because the mean of its divisors is an integer number (1355211).

Almost surely, 2^28756422 is an apocalyptic number.

28756422 is an abundant number, since it is smaller than the sum of its proper divisors (36293706).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28756422 is a wasteful number, since it uses less digits than its factorization.

28756422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805 (or 802 counting only the distinct ones).

The product of its digits is 53760, while the sum is 36.

The square root of 28756422 is about 5362.5014685313. The cubic root of 28756422 is about 306.3690919860.

The spelling of 28756422 in words is "twenty-eight million, seven hundred fifty-six thousand, four hundred twenty-two".