72215476864 has 16 divisors (see below), whose sum is σ = 143866770570. Its totient is φ = 36107738368.

The previous prime is 72215476831. The next prime is 72215476891. The reversal of 72215476864 is 46867451227.

It can be written as a sum of positive squares in only one way, i.e., 67388006464 + 4827470400 = 259592^2 + 69480^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282091579 + ... + 282091834.

Almost surely, 2^72215476864 is an apocalyptic number.

It is an amenable number.

72215476864 is a deficient number, since it is larger than the sum of its proper divisors (71651293706).

72215476864 is an equidigital number, since it uses as much as digits as its factorization.

72215476864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564183427 (or 564183415 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 52.

The spelling of 72215476864 in words is "seventy-two billion, two hundred fifteen million, four hundred seventy-six thousand, eight hundred sixty-four".