72147685 has 4 divisors (see below), whose sum is σ = 86577228. Its totient is φ = 57718144.

The previous prime is 72147671. The next prime is 72147701. The reversal of 72147685 is 58674127.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44595684 + 27552001 = 6678^2 + 5249^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72147685 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

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, 7214764 + ... + 7214773.

It is an arithmetic number, because the mean of its divisors is an integer number (21644307).

Almost surely, 2^72147685 is an apocalyptic number.

It is an amenable number.

72147685 is a deficient number, since it is larger than the sum of its proper divisors (14429543).

72147685 is a wasteful number, since it uses less digits than its factorization.

72147685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14429542.

The product of its digits is 94080, while the sum is 40.

The square root of 72147685 is about 8493.9793383314. The cubic root of 72147685 is about 416.3010121840.

The spelling of 72147685 in words is "seventy-two million, one hundred forty-seven thousand, six hundred eighty-five".