72399016 has 8 divisors (see below), whose sum is σ = 135748170. Its totient is φ = 36199504.

The previous prime is 72399013. The next prime is 72399023. The reversal of 72399016 is 61099327.

It can be written as a sum of positive squares in only one way, i.e., 49646116 + 22752900 = 7046^2 + 4770^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (72399011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4524931 + ... + 4524946.

Almost surely, 2^72399016 is an apocalyptic number.

It is an amenable number.

72399016 is a deficient number, since it is larger than the sum of its proper divisors (63349154).

72399016 is a wasteful number, since it uses less digits than its factorization.

72399016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9049883 (or 9049879 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 72399016 is about 8508.7611319157. The cubic root of 72399016 is about 416.7838555349.

The spelling of 72399016 in words is "seventy-two million, three hundred ninety-nine thousand, sixteen".