72406522 has 8 divisors (see below), whose sum is σ = 109061172. Its totient is φ = 36052800.

The previous prime is 72406517. The next prime is 72406541. The reversal of 72406522 is 22560427.

It can be written as a sum of positive squares in 2 ways, for example, as 59582961 + 12823561 = 7719^2 + 3581^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74629 + ... + 75592.

Almost surely, 2^72406522 is an apocalyptic number.

72406522 is a deficient number, since it is larger than the sum of its proper divisors (36654650).

72406522 is a wasteful number, since it uses less digits than its factorization.

72406522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150464.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 72406522 is about 8509.2021952707. The cubic root of 72406522 is about 416.7982584540.

Adding to 72406522 its reverse (22560427), we get a palindrome (94966949).

The spelling of 72406522 in words is "seventy-two million, four hundred six thousand, five hundred twenty-two".