72394630398856 has 8 divisors (see below), whose sum is σ = 135739931997870. Its totient is φ = 36197315199424.

The previous prime is 72394630398847. The next prime is 72394630398983. The reversal of 72394630398856 is 65889303649327.

It can be written as a sum of positive squares in only one way, i.e., 72319206564900 + 75423833956 = 8504070^2 + 274634^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×72394630398856² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4524664399921 + ... + 4524664399936.

Almost surely, 2^{72394630398856} is an apocalyptic number.

It is an amenable number.

72394630398856 is a deficient number, since it is larger than the sum of its proper divisors (63345301599014).

72394630398856 is a wasteful number, since it uses less digits than its factorization.

72394630398856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9049328799863 (or 9049328799859 counting only the distinct ones).

The product of its (nonzero) digits is 1410877440, while the sum is 73.

The spelling of 72394630398856 in words is "seventy-two trillion, three hundred ninety-four billion, six hundred thirty million, three hundred ninety-eight thousand, eight hundred fifty-six".