72331722 has 24 divisors (see below), whose sum is σ = 156988260. Its totient is φ = 24069120.

The previous prime is 72331717. The next prime is 72331723. The reversal of 72331722 is 22713327.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 70913241 + 1418481 = 8421^2 + 1191^2 .

It is not an unprimeable number, because it can be changed into a prime (72331723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8404 + ... + 14672.

Almost surely, 2^72331722 is an apocalyptic number.

72331722 is an abundant number, since it is smaller than the sum of its proper divisors (84656538).

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

72331722 is a wasteful number, since it uses less digits than its factorization.

72331722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6918 (or 6915 counting only the distinct ones).

The product of its digits is 3528, while the sum is 27.

The square root of 72331722 is about 8504.8058178891. The cubic root of 72331722 is about 416.6546836732.

It can be divided in two parts, 7 and 2331722, that added together give a square (2331729 = 1527²).

The spelling of 72331722 in words is "seventy-two million, three hundred thirty-one thousand, seven hundred twenty-two".