72721516 has 24 divisors (see below), whose sum is σ = 147830816. Its totient is φ = 30654720.

The previous prime is 72721511. The next prime is 72721547. The reversal of 72721516 is 61512727.

It is not an unprimeable number, because it can be changed into a prime (72721511) 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, 19581 + ... + 22996.

Almost surely, 2^72721516 is an apocalyptic number.

It is an amenable number.

72721516 is an abundant number, since it is smaller than the sum of its proper divisors (75109300).

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

72721516 is a wasteful number, since it uses less digits than its factorization.

72721516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42649 (or 42647 counting only the distinct ones).

The product of its digits is 5880, while the sum is 31.

The square root of 72721516 is about 8527.6911294910. The cubic root of 72721516 is about 417.4017907572.

It can be divided in two parts, 72721 and 516, that added together give a palindrome (73237).

The spelling of 72721516 in words is "seventy-two million, seven hundred twenty-one thousand, five hundred sixteen".