72313522 has 8 divisors (see below), whose sum is σ = 108652572. Its totient is φ = 36096000.

The previous prime is 72313517. The next prime is 72313523. The reversal of 72313522 is 22531327.

It can be written as a sum of positive squares in 2 ways, for example, as 57017601 + 15295921 = 7551^2 + 3911^2 .

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

It is not an unprimeable number, because it can be changed into a prime (72313523) 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, 28879 + ... + 31282.

Almost surely, 2^72313522 is an apocalyptic number.

72313522 is a deficient number, since it is larger than the sum of its proper divisors (36339050).

72313522 is a wasteful number, since it uses less digits than its factorization.

72313522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60764.

The product of its digits is 2520, while the sum is 25.

The square root of 72313522 is about 8503.7357672966. The cubic root of 72313522 is about 416.6197347317.

Adding to 72313522 its reverse (22531327), we get a palindrome (94844849).

The spelling of 72313522 in words is "seventy-two million, three hundred thirteen thousand, five hundred twenty-two".