28724172256 has 48 divisors (see below), whose sum is σ = 61470030384. Its totient is φ = 13133389824.

The previous prime is 28724172193. The next prime is 28724172299. The reversal of 28724172256 is 65227142782.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 278145 + ... + 367168.

It is an arithmetic number, because the mean of its divisors is an integer number (1280625633).

Almost surely, 2^28724172256 is an apocalyptic number.

28724172256 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28724172256 is an abundant number, since it is smaller than the sum of its proper divisors (32745858128).

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

28724172256 is a wasteful number, since it uses less digits than its factorization.

28724172256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645443 (or 645435 counting only the distinct ones).

The product of its digits is 752640, while the sum is 46.

The spelling of 28724172256 in words is "twenty-eight billion, seven hundred twenty-four million, one hundred seventy-two thousand, two hundred fifty-six".