72549522 has 12 divisors (see below), whose sum is σ = 157190670. Its totient is φ = 24183168.

The previous prime is 72549493. The next prime is 72549539. The reversal of 72549522 is 22594527.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 62110161 + 10439361 = 7881^2 + 3231^2 .

It is a super-3 number, since 3×72549522³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2015247 + ... + 2015282.

Almost surely, 2^72549522 is an apocalyptic number.

72549522 is an abundant number, since it is smaller than the sum of its proper divisors (84641148).

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

72549522 is a wasteful number, since it uses less digits than its factorization.

72549522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4030537 (or 4030534 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 72549522 is about 8517.6007185122. The cubic root of 72549522 is about 417.0724646766.

The spelling of 72549522 in words is "seventy-two million, five hundred forty-nine thousand, five hundred twenty-two".