667297398 has 8 divisors (see below), whose sum is σ = 1334594808. Its totient is φ = 222432464.

The previous prime is 667297369. The next prime is 667297403. The reversal of 667297398 is 893792766.

It is a happy number.

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

667297398 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55608111 + ... + 55608122.

It is an arithmetic number, because the mean of its divisors is an integer number (166824351).

Almost surely, 2^667297398 is an apocalyptic number.

667297398 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667297398 is a wasteful number, since it uses less digits than its factorization.

667297398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111216238.

The product of its digits is 6858432, while the sum is 57.

The square root of 667297398 is about 25832.1001469102. The cubic root of 667297398 is about 873.8558751852.

The spelling of 667297398 in words is "six hundred sixty-seven million, two hundred ninety-seven thousand, three hundred ninety-eight".