8520657972 has 12 divisors (see below), whose sum is σ = 19881535296. Its totient is φ = 2840219320.

The previous prime is 8520657953. The next prime is 8520657973. The reversal of 8520657972 is 2797560258.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×8520657972² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8520657973) 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, 355027404 + ... + 355027427.

It is an arithmetic number, because the mean of its divisors is an integer number (1656794608).

Almost surely, 2^8520657972 is an apocalyptic number.

It is an amenable number.

8520657972 is an abundant number, since it is smaller than the sum of its proper divisors (11360877324).

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

8520657972 is a wasteful number, since it uses less digits than its factorization.

8520657972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710054838 (or 710054836 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 51.

The square root of 8520657972 is about 92307.4101684150. The cubic root of 8520657972 is about 2042.4795215646.

The spelling of 8520657972 in words is "eight billion, five hundred twenty million, six hundred fifty-seven thousand, nine hundred seventy-two".