72499865 has 4 divisors (see below), whose sum is σ = 86999844. Its totient is φ = 57999888.

The previous prime is 72499831. The next prime is 72499873. The reversal of 72499865 is 56899427.

It is a happy number.

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 56731024 + 15768841 = 7532^2 + 3971^2 .

It is a cyclic number.

It is not a de Polignac number, because 72499865 - 2¹⁰ = 72498841 is a prime.

It is a Duffinian number.

It is a Curzon 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, 7249982 + ... + 7249991.

It is an arithmetic number, because the mean of its divisors is an integer number (21749961).

Almost surely, 2^72499865 is an apocalyptic number.

It is an amenable number.

72499865 is a deficient number, since it is larger than the sum of its proper divisors (14499979).

72499865 is a wasteful number, since it uses less digits than its factorization.

72499865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14499978.

The product of its digits is 1088640, while the sum is 50.

The square root of 72499865 is about 8514.6852554865. The cubic root of 72499865 is about 416.9772869563.

The spelling of 72499865 in words is "seventy-two million, four hundred ninety-nine thousand, eight hundred sixty-five".