28722252537 has 32 divisors (see below), whose sum is σ = 46592496000. Its totient is φ = 17342665920.

The previous prime is 28722252509. The next prime is 28722252553. The reversal of 28722252537 is 73525222782.

28722252537 is a `hidden beast` number, since 2 + 8 + 72 + 22 + 525 + 37 = 666.

It is not a de Polignac number, because 28722252537 - 2⁸ = 28722252281 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28722252492 and 28722252501.

It is not an unprimeable number, because it can be changed into a prime (28722252137) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99862 + ... + 259647.

It is an arithmetic number, because the mean of its divisors is an integer number (1456015500).

Almost surely, 2^28722252537 is an apocalyptic number.

28722252537 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28722252537 is a deficient number, since it is larger than the sum of its proper divisors (17870243463).

28722252537 is a wasteful number, since it uses less digits than its factorization.

28722252537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359798 (or 359792 counting only the distinct ones).

The product of its digits is 940800, while the sum is 45.

The spelling of 28722252537 in words is "twenty-eight billion, seven hundred twenty-two million, two hundred fifty-two thousand, five hundred thirty-seven".