72691522 has 4 divisors (see below), whose sum is σ = 109037286. Its totient is φ = 36345760.

The previous prime is 72691519. The next prime is 72691537. The reversal of 72691522 is 22519627.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 72097081 + 594441 = 8491^2 + 771^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18172879 + ... + 18172882.

Almost surely, 2^72691522 is an apocalyptic number.

72691522 is a deficient number, since it is larger than the sum of its proper divisors (36345764).

72691522 is a wasteful number, since it uses less digits than its factorization.

72691522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36345763.

The product of its digits is 15120, while the sum is 34.

The square root of 72691522 is about 8525.9323243854. The cubic root of 72691522 is about 417.3443970557.

The spelling of 72691522 in words is "seventy-two million, six hundred ninety-one thousand, five hundred twenty-two".