667400737 has 4 divisors (see below), whose sum is σ = 670788756. Its totient is φ = 664012720.

The previous prime is 667400731. The next prime is 667400761. The reversal of 667400737 is 737004766.

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

It can be written as a sum of positive squares in 2 ways, for example, as 603144481 + 64256256 = 24559^2 + 8016^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667400737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 667400737.

It is not an unprimeable number, because it can be changed into a prime (667400731) 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, 1693714 + ... + 1694107.

It is an arithmetic number, because the mean of its divisors is an integer number (167697189).

Almost surely, 2^667400737 is an apocalyptic number.

It is an amenable number.

667400737 is a deficient number, since it is larger than the sum of its proper divisors (3388019).

667400737 is a wasteful number, since it uses less digits than its factorization.

667400737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3388018.

The product of its (nonzero) digits is 148176, while the sum is 40.

The square root of 667400737 is about 25834.1002746370. The cubic root of 667400737 is about 873.9009818755.

The spelling of 667400737 in words is "six hundred sixty-seven million, four hundred thousand, seven hundred thirty-seven".