72168858 has 12 divisors (see below), whose sum is σ = 156365898. Its totient is φ = 24056280.

The previous prime is 72168857. The next prime is 72168869. The reversal of 72168858 is 85886127.

It can be written as a sum of positive squares in only one way, i.e., 68608089 + 3560769 = 8283^2 + 1887^2 .

It is not an unprimeable number, because it can be changed into a prime (72168857) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 2004673 + ... + 2004708.

Almost surely, 2^72168858 is an apocalyptic number.

72168858 is an abundant number, since it is smaller than the sum of its proper divisors (84197040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72168858 is a wasteful number, since it uses less digits than its factorization.

72168858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4009389 (or 4009386 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 72168858 is about 8495.2256003004. The cubic root of 72168858 is about 416.3417318053.

The spelling of 72168858 in words is "seventy-two million, one hundred sixty-eight thousand, eight hundred fifty-eight".