72865399 has 4 divisors (see below), whose sum is σ = 76700440. Its totient is φ = 69030360.

The previous prime is 72865379. The next prime is 72865409. The reversal of 72865399 is 99356827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99356827 = 457 ⋅217411.

It is a cyclic number.

It is not a de Polignac number, because 72865399 - 2⁷ = 72865271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72865379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1917492 + ... + 1917529.

It is an arithmetic number, because the mean of its divisors is an integer number (19175110).

Almost surely, 2^72865399 is an apocalyptic number.

72865399 is a deficient number, since it is larger than the sum of its proper divisors (3835041).

72865399 is a wasteful number, since it uses less digits than its factorization.

72865399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3835040.

The product of its digits is 816480, while the sum is 49.

The square root of 72865399 is about 8536.1231832724. The cubic root of 72865399 is about 417.6768925431.

The spelling of 72865399 in words is "seventy-two million, eight hundred sixty-five thousand, three hundred ninety-nine".