72218570 has 16 divisors (see below), whose sum is σ = 130372200. Its totient is φ = 28803264.

The previous prime is 72218569. The next prime is 72218579. The reversal of 72218570 is 7581227.

It can be written as a sum of positive squares in 4 ways, for example, as 71351809 + 866761 = 8447^2 + 931^2 .

It is not an unprimeable number, because it can be changed into a prime (72218579) 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, 6857 + ... + 13836.

Almost surely, 2^72218570 is an apocalyptic number.

72218570 is a deficient number, since it is larger than the sum of its proper divisors (58153630).

72218570 is a wasteful number, since it uses less digits than its factorization.

72218570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21049.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 72218570 is about 8498.1509753593. The cubic root of 72218570 is about 416.4373059457.

Adding to 72218570 its reverse (7581227), we get a palindrome (79799797).

The spelling of 72218570 in words is "seventy-two million, two hundred eighteen thousand, five hundred seventy".