72513418 has 8 divisors (see below), whose sum is σ = 108849348. Its totient is φ = 36230304.

The previous prime is 72513409. The next prime is 72513421. The reversal of 72513418 is 81431527.

It can be written as a sum of positive squares in 2 ways, for example, as 59861169 + 12652249 = 7737^2 + 3557^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 72513418.

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 3 ways as a sum of consecutive naturals, for example, 9571 + ... + 15382.

Almost surely, 2^72513418 is an apocalyptic number.

72513418 is a deficient number, since it is larger than the sum of its proper divisors (36335930).

72513418 is a wasteful number, since it uses less digits than its factorization.

72513418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26408.

The product of its digits is 6720, while the sum is 31.

The square root of 72513418 is about 8515.4810786003. The cubic root of 72513418 is about 417.0032683429.

The spelling of 72513418 in words is "seventy-two million, five hundred thirteen thousand, four hundred eighteen".