72231802 has 4 divisors (see below), whose sum is σ = 108347706. Its totient is φ = 36115900.

The previous prime is 72231781. The next prime is 72231811. The reversal of 72231802 is 20813227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20813227 = 19 ⋅1095433.

It can be written as a sum of positive squares in only one way, i.e., 69538921 + 2692881 = 8339^2 + 1641^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18057949 + ... + 18057952.

Almost surely, 2^72231802 is an apocalyptic number.

72231802 is a deficient number, since it is larger than the sum of its proper divisors (36115904).

72231802 is a wasteful number, since it uses less digits than its factorization.

72231802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36115903.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 72231802 is about 8498.9294619970. The cubic root of 72231802 is about 416.4627378253.

It can be divided in two parts, 7223 and 1802, that added together give a square (9025 = 95²).

The spelling of 72231802 in words is "seventy-two million, two hundred thirty-one thousand, eight hundred two".