72117142 has 16 divisors (see below), whose sum is σ = 112109760. Its totient is φ = 34751808.

The previous prime is 72117139. The next prime is 72117151. The reversal of 72117142 is 24171127.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53683 + ... + 55009.

It is an arithmetic number, because the mean of its divisors is an integer number (7006860).

Almost surely, 2^72117142 is an apocalyptic number.

72117142 is a deficient number, since it is larger than the sum of its proper divisors (39992618).

72117142 is a wasteful number, since it uses less digits than its factorization.

72117142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2295.

The product of its digits is 784, while the sum is 25.

The square root of 72117142 is about 8492.1812274586. The cubic root of 72117142 is about 416.2422582706.

Adding to 72117142 its reverse (24171127), we get a palindrome (96288269).

The spelling of 72117142 in words is "seventy-two million, one hundred seventeen thousand, one hundred forty-two".