72013522 has 16 divisors (see below), whose sum is σ = 123560640. Its totient is φ = 30835728.

The previous prime is 72013517. The next prime is 72013531. The reversal of 72013522 is 22531027.

It is a junction number, because it is equal to n+sod(n) for n = 72013493 and 72013502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30604 + ... + 32872.

It is an arithmetic number, because the mean of its divisors is an integer number (7722540).

Almost surely, 2^72013522 is an apocalyptic number.

72013522 is a deficient number, since it is larger than the sum of its proper divisors (51547118).

72013522 is a wasteful number, since it uses less digits than its factorization.

72013522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4545.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 72013522 is about 8486.0781283229. The cubic root of 72013522 is about 416.0428064001.

Adding to 72013522 its reverse (22531027), we get a palindrome (94544549).

The spelling of 72013522 in words is "seventy-two million, thirteen thousand, five hundred twenty-two".