72072322621 has 16 divisors (see below), whose sum is σ = 78633601200. Its totient is φ = 65661124608.

The previous prime is 72072322601. The next prime is 72072322627. The reversal of 72072322621 is 12622327027.

It can be written as a sum of positive squares in 8 ways, for example, as 116942596 + 71955380025 = 10814^2 + 268245^2 .

It is a cyclic number.

It is not a de Polignac number, because 72072322621 - 2¹³ = 72072314429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72072322627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265215 + ... + 463123.

It is an arithmetic number, because the mean of its divisors is an integer number (4914600075).

Almost surely, 2^72072322621 is an apocalyptic number.

It is an amenable number.

72072322621 is a deficient number, since it is larger than the sum of its proper divisors (6561278579).

72072322621 is a wasteful number, since it uses less digits than its factorization.

72072322621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198288.

The product of its (nonzero) digits is 28224, while the sum is 34.

Adding to 72072322621 its reverse (12622327027), we get a palindrome (84694649648).

The spelling of 72072322621 in words is "seventy-two billion, seventy-two million, three hundred twenty-two thousand, six hundred twenty-one".