72566970388 has 18 divisors (see below), whose sum is σ = 139586466698. Its totient is φ = 32984986320.

The previous prime is 72566970373. The next prime is 72566970407. The reversal of 72566970388 is 88307966527.

It can be written as a sum of positive squares in only one way, i.e., 37259808784 + 35307161604 = 193028^2 + 187902^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 74965395 + ... + 74966362.

Almost surely, 2^72566970388 is an apocalyptic number.

It is an amenable number.

72566970388 is a deficient number, since it is larger than the sum of its proper divisors (67019496310).

72566970388 is a wasteful number, since it uses less digits than its factorization.

72566970388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149931783 (or 149931770 counting only the distinct ones).

The product of its (nonzero) digits is 30481920, while the sum is 61.

The spelling of 72566970388 in words is "seventy-two billion, five hundred sixty-six million, nine hundred seventy thousand, three hundred eighty-eight".