28250072656 has 20 divisors (see below), whose sum is σ = 58944863572. Its totient is φ = 13038494976.

The previous prime is 28250072639. The next prime is 28250072657. The reversal of 28250072656 is 65627005282.

It can be written as a sum of positive squares in 2 ways, for example, as 7496789056 + 20753283600 = 86584^2 + 144060^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28250072657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67908621 + ... + 67909036.

Almost surely, 2^28250072656 is an apocalyptic number.

28250072656 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28250072656 is an abundant number, since it is smaller than the sum of its proper divisors (30694790916).

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

28250072656 is a wasteful number, since it uses less digits than its factorization.

28250072656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135817678 (or 135817672 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 43.

The spelling of 28250072656 in words is "twenty-eight billion, two hundred fifty million, seventy-two thousand, six hundred fifty-six".