72163565 has 8 divisors (see below), whose sum is σ = 88439040. Its totient is φ = 56502352.

The previous prime is 72163561. The next prime is 72163573. The reversal of 72163565 is 56536127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72163565 - 2² = 72163561 is a prime.

It is a super-2 number, since 2×72163565² = 10415160227018450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72163561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153305 + ... + 153774.

It is an arithmetic number, because the mean of its divisors is an integer number (11054880).

Almost surely, 2^72163565 is an apocalyptic number.

It is an amenable number.

72163565 is a deficient number, since it is larger than the sum of its proper divisors (16275475).

72163565 is a wasteful number, since it uses less digits than its factorization.

72163565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307131.

The product of its digits is 37800, while the sum is 35.

The square root of 72163565 is about 8494.9140666637. The cubic root of 72163565 is about 416.3315531274.

The spelling of 72163565 in words is "seventy-two million, one hundred sixty-three thousand, five hundred sixty-five".