72142865 has 8 divisors (see below), whose sum is σ = 89556840. Its totient is φ = 55724032.

The previous prime is 72142813. The next prime is 72142871. The reversal of 72142865 is 56824127.

It can be written as a sum of positive squares in 4 ways, for example, as 96721 + 72046144 = 311^2 + 8488^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72142865 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248624 + ... + 248913.

It is an arithmetic number, because the mean of its divisors is an integer number (11194605).

Almost surely, 2^72142865 is an apocalyptic number.

It is an amenable number.

72142865 is a deficient number, since it is larger than the sum of its proper divisors (17413975).

72142865 is a wasteful number, since it uses less digits than its factorization.

72142865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497571.

The product of its digits is 26880, while the sum is 35.

The square root of 72142865 is about 8493.6956032107. The cubic root of 72142865 is about 416.2917413133.

The spelling of 72142865 in words is "seventy-two million, one hundred forty-two thousand, eight hundred sixty-five".