72170666 has 8 divisors (see below), whose sum is σ = 111748224. Its totient is φ = 34921260.

The previous prime is 72170663. The next prime is 72170669. The reversal of 72170666 is 66607127.

It is an interprime number because it is at equal distance from previous prime (72170663) and next prime (72170669).

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72170663) 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 3 ways as a sum of consecutive naturals, for example, 581960 + ... + 582083.

It is an arithmetic number, because the mean of its divisors is an integer number (13968528).

Almost surely, 2^72170666 is an apocalyptic number.

72170666 is a deficient number, since it is larger than the sum of its proper divisors (39577558).

72170666 is a wasteful number, since it uses less digits than its factorization.

72170666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164076.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 72170666 is about 8495.3320123465. The cubic root of 72170666 is about 416.3452085568.

The spelling of 72170666 in words is "seventy-two million, one hundred seventy thousand, six hundred sixty-six".