72039361 has 4 divisors (see below), whose sum is σ = 72752724. Its totient is φ = 71326000.

The previous prime is 72039329. The next prime is 72039379. The reversal of 72039361 is 16393027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16393027 = 7 ⋅2341861.

It can be written as a sum of positive squares in 2 ways, for example, as 40398736 + 31640625 = 6356^2 + 5625^2 .

It is a cyclic number.

It is not a de Polignac number, because 72039361 - 2⁵ = 72039329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72039301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356530 + ... + 356731.

It is an arithmetic number, because the mean of its divisors is an integer number (18188181).

Almost surely, 2^72039361 is an apocalyptic number.

It is an amenable number.

72039361 is a deficient number, since it is larger than the sum of its proper divisors (713363).

72039361 is a wasteful number, since it uses less digits than its factorization.

72039361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713362.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 72039361 is about 8487.6004265045. The cubic root of 72039361 is about 416.0925602254.

The spelling of 72039361 in words is "seventy-two million, thirty-nine thousand, three hundred sixty-one".