72142870 has 32 divisors (see below), whose sum is σ = 132821856. Its totient is φ = 28204800.

The previous prime is 72142813. The next prime is 72142871. The reversal of 72142870 is 7824127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72142871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138210 + ... + 138730.

It is an arithmetic number, because the mean of its divisors is an integer number (4150683).

Almost surely, 2^72142870 is an apocalyptic number.

72142870 is a deficient number, since it is larger than the sum of its proper divisors (60678986).

72142870 is a wasteful number, since it uses less digits than its factorization.

72142870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 72142870 is about 8493.6958975466. The cubic root of 72142870 is about 416.2917509306.

Adding to 72142870 its reverse (7824127), we get a palindrome (79966997).

The spelling of 72142870 in words is "seventy-two million, one hundred forty-two thousand, eight hundred seventy".