8521205772 has 24 divisors (see below), whose sum is σ = 20009460016. Its totient is φ = 2822309568.

The previous prime is 8521205753. The next prime is 8521205789. The reversal of 8521205772 is 2775021258.

It is a super-2 number, since 2×8521205772² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8521205772.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2259583 + ... + 2263350.

Almost surely, 2^8521205772 is an apocalyptic number.

It is an amenable number.

8521205772 is an abundant number, since it is smaller than the sum of its proper divisors (11488254244).

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

8521205772 is a wasteful number, since it uses less digits than its factorization.

8521205772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4523097 (or 4523095 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 39.

The square root of 8521205772 is about 92310.3773797941. The cubic root of 8521205772 is about 2042.5232915140.

The spelling of 8521205772 in words is "eight billion, five hundred twenty-one million, two hundred five thousand, seven hundred seventy-two".