72166672 has 20 divisors (see below), whose sum is σ = 141794496. Its totient is φ = 35574560.

The previous prime is 72166657. The next prime is 72166673. The reversal of 72166672 is 27666127.

It is not an unprimeable number, because it can be changed into a prime (72166673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30628 + ... + 32899.

Almost surely, 2^72166672 is an apocalyptic number.

It is an amenable number.

72166672 is a deficient number, since it is larger than the sum of its proper divisors (69627824).

72166672 is a wasteful number, since it uses less digits than its factorization.

72166672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63606 (or 63600 counting only the distinct ones).

The product of its digits is 42336, while the sum is 37.

The square root of 72166672 is about 8495.0969388230. The cubic root of 72166672 is about 416.3375280889.

The spelling of 72166672 in words is "seventy-two million, one hundred sixty-six thousand, six hundred seventy-two".