72356398434 has 12 divisors (see below), whose sum is σ = 156772196646. Its totient is φ = 24118799472.

The previous prime is 72356398417. The next prime is 72356398459. The reversal of 72356398434 is 43489365327.

72356398434 is a `hidden beast` number, since 72 + 3 + 56 + 3 + 98 + 434 = 666.

It can be written as a sum of positive squares in only one way, i.e., 63511560225 + 8844838209 = 252015^2 + 94047^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2009899939 + ... + 2009899974.

Almost surely, 2^72356398434 is an apocalyptic number.

72356398434 is an abundant number, since it is smaller than the sum of its proper divisors (84415798212).

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

72356398434 is a wasteful number, since it uses less digits than its factorization.

72356398434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4019799921 (or 4019799918 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 54.

The spelling of 72356398434 in words is "seventy-two billion, three hundred fifty-six million, three hundred ninety-eight thousand, four hundred thirty-four".