72439522 has 4 divisors (see below), whose sum is σ = 108659286. Its totient is φ = 36219760.

The previous prime is 72439519. The next prime is 72439537. The reversal of 72439522 is 22593427.

It is a happy number.

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., 72437121 + 2401 = 8511^2 + 49^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18109879 + ... + 18109882.

Almost surely, 2^72439522 is an apocalyptic number.

72439522 is a deficient number, since it is larger than the sum of its proper divisors (36219764).

72439522 is a wasteful number, since it uses less digits than its factorization.

72439522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36219763.

The product of its digits is 30240, while the sum is 34.

The square root of 72439522 is about 8511.1410515864. The cubic root of 72439522 is about 416.8615688351.

The spelling of 72439522 in words is "seventy-two million, four hundred thirty-nine thousand, five hundred twenty-two".