72899137 has 4 divisors (see below), whose sum is σ = 72931716. Its totient is φ = 72866560.

The previous prime is 72899119. The next prime is 72899171. The reversal of 72899137 is 73199827.

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 65950641 + 6948496 = 8121^2 + 2636^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72899137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72899117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12664 + ... + 17497.

It is an arithmetic number, because the mean of its divisors is an integer number (18232929).

Almost surely, 2^72899137 is an apocalyptic number.

It is an amenable number.

72899137 is a deficient number, since it is larger than the sum of its proper divisors (32579).

72899137 is a wasteful number, since it uses less digits than its factorization.

72899137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32578.

The product of its digits is 190512, while the sum is 46.

The square root of 72899137 is about 8538.0991444232. The cubic root of 72899137 is about 417.7413465861.

It can be divided in two parts, 728991 and 37, that added together give a triangular number (729028 = T₁₂₀₇).

The spelling of 72899137 in words is "seventy-two million, eight hundred ninety-nine thousand, one hundred thirty-seven".