72918686 has 8 divisors (see below), whose sum is σ = 109626264. Its totient is φ = 36376600.

The previous prime is 72918641. The next prime is 72918689. The reversal of 72918686 is 68681927.

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 72918686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72918689) by changing a digit.

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, 40265 + ... + 42036.

It is an arithmetic number, because the mean of its divisors is an integer number (13703283).

Almost surely, 2^72918686 is an apocalyptic number.

72918686 is a deficient number, since it is larger than the sum of its proper divisors (36707578).

72918686 is a wasteful number, since it uses less digits than its factorization.

72918686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82746.

The product of its digits is 290304, while the sum is 47.

The square root of 72918686 is about 8539.2438775339. The cubic root of 72918686 is about 417.7786844570.

The spelling of 72918686 in words is "seventy-two million, nine hundred eighteen thousand, six hundred eighty-six".