72321166 has 8 divisors (see below), whose sum is σ = 109336320. Its totient is φ = 35875728.

The previous prime is 72321143. The next prime is 72321167. The reversal of 72321166 is 66112327.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72321167) 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, 142111 + ... + 142618.

It is an arithmetic number, because the mean of its divisors is an integer number (13667040).

Almost surely, 2^72321166 is an apocalyptic number.

72321166 is a deficient number, since it is larger than the sum of its proper divisors (37015154).

72321166 is a wasteful number, since it uses less digits than its factorization.

72321166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284858.

The product of its digits is 3024, while the sum is 28.

The square root of 72321166 is about 8504.1852049447. The cubic root of 72321166 is about 416.6344140013.

The spelling of 72321166 in words is "seventy-two million, three hundred twenty-one thousand, one hundred sixty-six".