72784516631 has 8 divisors (see below), whose sum is σ = 73458451440. Its totient is φ = 72110694528.

The previous prime is 72784516603. The next prime is 72784516687. The reversal of 72784516631 is 13661548727.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72784516631 is a prime.

It is a super-2 number, since 2×72784516631² (a number of 23 digits) contains 22 as substring.

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 72784516631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72784519631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1836335 + ... + 1875551.

It is an arithmetic number, because the mean of its divisors is an integer number (9182306430).

Almost surely, 2^72784516631 is an apocalyptic number.

72784516631 is a deficient number, since it is larger than the sum of its proper divisors (673934809).

72784516631 is a wasteful number, since it uses less digits than its factorization.

72784516631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56353.

The product of its digits is 1693440, while the sum is 50.

The spelling of 72784516631 in words is "seventy-two billion, seven hundred eighty-four million, five hundred sixteen thousand, six hundred thirty-one".