72318717 has 8 divisors (see below), whose sum is σ = 107138880. Its totient is φ = 48212460.

The previous prime is 72318713. The next prime is 72318749. The reversal of 72318717 is 71781327.

It is a happy number.

It is not a de Polignac number, because 72318717 - 2² = 72318713 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72318713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1339209 + ... + 1339262.

It is an arithmetic number, because the mean of its divisors is an integer number (13392360).

Almost surely, 2^72318717 is an apocalyptic number.

It is an amenable number.

72318717 is a deficient number, since it is larger than the sum of its proper divisors (34820163).

72318717 is a wasteful number, since it uses less digits than its factorization.

72318717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2678480 (or 2678474 counting only the distinct ones).

The product of its digits is 16464, while the sum is 36.

The square root of 72318717 is about 8504.0412157985. The cubic root of 72318717 is about 416.6297111402.

The spelling of 72318717 in words is "seventy-two million, three hundred eighteen thousand, seven hundred seventeen".