72351865 has 4 divisors (see below), whose sum is σ = 86822244. Its totient is φ = 57881488.

The previous prime is 72351841. The next prime is 72351899. The reversal of 72351865 is 56815327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56815327 = 3989 ⋅14243.

It can be written as a sum of positive squares in 2 ways, for example, as 36675136 + 35676729 = 6056^2 + 5973^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72351865 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7235182 + ... + 7235191.

It is an arithmetic number, because the mean of its divisors is an integer number (21705561).

Almost surely, 2^72351865 is an apocalyptic number.

It is an amenable number.

72351865 is a deficient number, since it is larger than the sum of its proper divisors (14470379).

72351865 is a wasteful number, since it uses less digits than its factorization.

72351865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14470378.

The product of its digits is 50400, while the sum is 37.

The square root of 72351865 is about 8505.9899482659. The cubic root of 72351865 is about 416.6933568681.

The spelling of 72351865 in words is "seventy-two million, three hundred fifty-one thousand, eight hundred sixty-five".