72687764322 has 24 divisors (see below), whose sum is σ = 158177894940. Its totient is φ = 24123448800.

The previous prime is 72687764309. The next prime is 72687764339. The reversal of 72687764322 is 22346778627.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 46698777801 + 25988986521 = 216099^2 + 161211^2 .

It is a super-2 number, since 2×72687764322² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8812929 + ... + 8821172.

Almost surely, 2^72687764322 is an apocalyptic number.

72687764322 is an abundant number, since it is smaller than the sum of its proper divisors (85490130618).

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

72687764322 is a wasteful number, since it uses less digits than its factorization.

72687764322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17634338 (or 17634335 counting only the distinct ones).

The product of its digits is 9483264, while the sum is 54.

The spelling of 72687764322 in words is "seventy-two billion, six hundred eighty-seven million, seven hundred sixty-four thousand, three hundred twenty-two".