72615705720 has 64 divisors (see below), whose sum is σ = 224874455040. Its totient is φ = 18739536000.

The previous prime is 72615705709. The next prime is 72615705787. The reversal of 72615705720 is 2750751627.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9756456 + ... + 9763895.

It is an arithmetic number, because the mean of its divisors is an integer number (3513663360).

Almost surely, 2^72615705720 is an apocalyptic number.

It is an amenable number.

72615705720 is an abundant number, since it is smaller than the sum of its proper divisors (152258749320).

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

72615705720 is a wasteful number, since it uses less digits than its factorization.

72615705720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19520396 (or 19520392 counting only the distinct ones).

The product of its (nonzero) digits is 205800, while the sum is 42.

The spelling of 72615705720 in words is "seventy-two billion, six hundred fifteen million, seven hundred five thousand, seven hundred twenty".