72164797 has 4 divisors (see below), whose sum is σ = 73924956. Its totient is φ = 70404640.

The previous prime is 72164783. The next prime is 72164801. The reversal of 72164797 is 79746127.

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 26925721 + 45239076 = 5189^2 + 6726^2 .

It is a cyclic number.

It is not a de Polignac number, because 72164797 - 2⁷ = 72164669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72164737) 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, 880018 + ... + 880099.

It is an arithmetic number, because the mean of its divisors is an integer number (18481239).

Almost surely, 2^72164797 is an apocalyptic number.

It is an amenable number.

72164797 is a deficient number, since it is larger than the sum of its proper divisors (1760159).

72164797 is a wasteful number, since it uses less digits than its factorization.

72164797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760158.

The product of its digits is 148176, while the sum is 43.

The square root of 72164797 is about 8494.9865803308. The cubic root of 72164797 is about 416.3339223635. Note that the first 3 decimals are identical.

The spelling of 72164797 in words is "seventy-two million, one hundred sixty-four thousand, seven hundred ninety-seven".