72613865 has 8 divisors (see below), whose sum is σ = 87385608. Its totient is φ = 57925120.

The previous prime is 72613861. The next prime is 72613889. The reversal of 72613865 is 56831627.

It can be written as a sum of positive squares in 4 ways, for example, as 6744409 + 65869456 = 2597^2 + 8116^2 .

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

It is not a de Polignac number, because 72613865 - 2² = 72613861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72613861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18806 + ... + 22335.

It is an arithmetic number, because the mean of its divisors is an integer number (10923201).

Almost surely, 2^72613865 is an apocalyptic number.

It is an amenable number.

72613865 is a deficient number, since it is larger than the sum of its proper divisors (14771743).

72613865 is a wasteful number, since it uses less digits than its factorization.

72613865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41499.

The product of its digits is 60480, while the sum is 38.

The square root of 72613865 is about 8521.3769427247. The cubic root of 72613865 is about 417.1957265231.

The spelling of 72613865 in words is "seventy-two million, six hundred thirteen thousand, eight hundred sixty-five".