28397642256 has 225 divisors, whose sum is σ = 85494026079. Its totient is φ = 9099864000.

The previous prime is 28397642249. The next prime is 28397642279. The reversal of 28397642256 is 65224679382.

The square root of 28397642256 is 168516.

It is a perfect power (a square), and thus also a powerful number.

28397642256 is a `hidden beast` number, since 2 + 83 + 97 + 6 + 422 + 56 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

Its product of digits (8709120) is a multiple of the sum of its prime factors (384).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 188063781 + ... + 188063931.

Almost surely, 2^28397642256 is an apocalyptic number.

28397642256 is the 168516-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28397642256

28397642256 is an abundant number, since it is smaller than the sum of its proper divisors (57096383823).

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

28397642256 is an equidigital number, since it uses as much as digits as its factorization.

28397642256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384 (or 187 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 54.

The spelling of 28397642256 in words is "twenty-eight billion, three hundred ninety-seven million, six hundred forty-two thousand, two hundred fifty-six".