72576137 has 4 divisors (see below), whose sum is σ = 72636420. Its totient is φ = 72515856.

The previous prime is 72576107. The next prime is 72576139. The reversal of 72576137 is 73167527.

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 72267001 + 309136 = 8501^2 + 556^2 .

It is a cyclic number.

It is not a de Polignac number, because 72576137 - 2⁶ = 72576073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72576137.

It is not an unprimeable number, because it can be changed into a prime (72576139) 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, 28298 + ... + 30755.

It is an arithmetic number, because the mean of its divisors is an integer number (18159105).

Almost surely, 2^72576137 is an apocalyptic number.

It is an amenable number.

72576137 is a deficient number, since it is larger than the sum of its proper divisors (60283).

72576137 is a wasteful number, since it uses less digits than its factorization.

72576137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60282.

The product of its digits is 61740, while the sum is 38.

The square root of 72576137 is about 8519.1629283633. The cubic root of 72576137 is about 417.1234598507.

The spelling of 72576137 in words is "seventy-two million, five hundred seventy-six thousand, one hundred thirty-seven".