72702830721 has 4 divisors (see below), whose sum is σ = 96937107632. Its totient is φ = 48468553812.

The previous prime is 72702830713. The next prime is 72702830729. The reversal of 72702830721 is 12703820727.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (72702830713) and next prime (72702830729).

It is not a de Polignac number, because 72702830721 - 2³ = 72702830713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72702830721.

It is not an unprimeable number, because it can be changed into a prime (72702830729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12117138451 + ... + 12117138456.

It is an arithmetic number, because the mean of its divisors is an integer number (24234276908).

Almost surely, 2^72702830721 is an apocalyptic number.

It is an amenable number.

72702830721 is a deficient number, since it is larger than the sum of its proper divisors (24234276911).

72702830721 is a wasteful number, since it uses less digits than its factorization.

72702830721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24234276910.

The product of its (nonzero) digits is 65856, while the sum is 39.

The spelling of 72702830721 in words is "seventy-two billion, seven hundred two million, eight hundred thirty thousand, seven hundred twenty-one".