72165023 has 4 divisors (see below), whose sum is σ = 82474320. Its totient is φ = 61855728.

The previous prime is 72165001. The next prime is 72165029. The reversal of 72165023 is 32056127.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72165023 - 2¹² = 72160927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72164983 and 72165001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72165029) 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, 5154638 + ... + 5154651.

It is an arithmetic number, because the mean of its divisors is an integer number (20618580).

Almost surely, 2^72165023 is an apocalyptic number.

72165023 is a deficient number, since it is larger than the sum of its proper divisors (10309297).

72165023 is a wasteful number, since it uses less digits than its factorization.

72165023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10309296.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 72165023 is about 8494.9998822837. Note that the first 3 decimals coincide. The cubic root of 72165023 is about 416.3343569769.

The spelling of 72165023 in words is "seventy-two million, one hundred sixty-five thousand, twenty-three".