72136897 has 4 divisors (see below), whose sum is σ = 82442176. Its totient is φ = 61831620.

The previous prime is 72136873. The next prime is 72136931. The reversal of 72136897 is 79863127.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72136897 - 2⁷ = 72136769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72136807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5152629 + ... + 5152642.

It is an arithmetic number, because the mean of its divisors is an integer number (20610544).

Almost surely, 2^72136897 is an apocalyptic number.

It is an amenable number.

72136897 is a deficient number, since it is larger than the sum of its proper divisors (10305279).

72136897 is a wasteful number, since it uses less digits than its factorization.

72136897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10305278.

The product of its digits is 127008, while the sum is 43.

The square root of 72136897 is about 8493.3442765497. The cubic root of 72136897 is about 416.2802617876.

The spelling of 72136897 in words is "seventy-two million, one hundred thirty-six thousand, eight hundred ninety-seven".