72170667 has 6 divisors (see below), whose sum is σ = 104246532. Its totient is φ = 48113772.

The previous prime is 72170663. The next prime is 72170669. The reversal of 72170667 is 76607127.

It is not a de Polignac number, because 72170667 - 2² = 72170663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72170663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4009473 + ... + 4009490.

It is an arithmetic number, because the mean of its divisors is an integer number (17374422).

Almost surely, 2^72170667 is an apocalyptic number.

72170667 is a deficient number, since it is larger than the sum of its proper divisors (32075865).

72170667 is a wasteful number, since it uses less digits than its factorization.

72170667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8018969 (or 8018966 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 72170667 is about 8495.3320712024. The cubic root of 72170667 is about 416.3452104798.

The spelling of 72170667 in words is "seventy-two million, one hundred seventy thousand, six hundred sixty-seven".