72715645 has 8 divisors (see below), whose sum is σ = 87712056. Its totient is φ = 57870336.

The previous prime is 72715637. The next prime is 72715651. The reversal of 72715645 is 54651727.

It can be written as a sum of positive squares in 4 ways, for example, as 13410244 + 59305401 = 3662^2 + 7701^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 72715645 - 2³ = 72715637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36712 + ... + 38641.

It is an arithmetic number, because the mean of its divisors is an integer number (10964007).

Almost surely, 2^72715645 is an apocalyptic number.

It is an amenable number.

72715645 is a deficient number, since it is larger than the sum of its proper divisors (14996411).

72715645 is a wasteful number, since it uses less digits than its factorization.

72715645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75551.

The product of its digits is 58800, while the sum is 37.

The square root of 72715645 is about 8527.3468910324. The cubic root of 72715645 is about 417.3905578053.

The spelling of 72715645 in words is "seventy-two million, seven hundred fifteen thousand, six hundred forty-five".