667070731 has 4 divisors (see below), whose sum is σ = 690073200. Its totient is φ = 644068264.

The previous prime is 667070713. The next prime is 667070759. The reversal of 667070731 is 137070766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 667070731 - 2²¹ = 664973579 is a prime.

It is a super-2 number, since 2×667070731² = 889966720313748722, which contains 22 as substring.

It is a Duffinian number.

667070731 is a modest number, since divided by 70731 gives 6670 as remainder.

It is not an unprimeable number, because it can be changed into a prime (667074731) 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, 11501191 + ... + 11501248.

It is an arithmetic number, because the mean of its divisors is an integer number (172518300).

Almost surely, 2^667070731 is an apocalyptic number.

667070731 is a deficient number, since it is larger than the sum of its proper divisors (23002469).

667070731 is a wasteful number, since it uses less digits than its factorization.

667070731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23002468.

The product of its (nonzero) digits is 37044, while the sum is 37.

The square root of 667070731 is about 25827.7124616177. The cubic root of 667070731 is about 873.7569204454.

The spelling of 667070731 in words is "six hundred sixty-seven million, seventy thousand, seven hundred thirty-one".