667900398 has 48 divisors (see below), whose sum is σ = 1471352400. Its totient is φ = 201970560.

The previous prime is 667900393. The next prime is 667900447. The reversal of 667900398 is 893009766.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667900391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 636178 + ... + 637226.

It is an arithmetic number, because the mean of its divisors is an integer number (30653175).

Almost surely, 2^667900398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667900398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (735676200).

667900398 is an abundant number, since it is smaller than the sum of its proper divisors (803452002).

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

667900398 is a wasteful number, since it uses less digits than its factorization.

667900398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1953 (or 1942 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 667900398 is about 25843.7690362687. The cubic root of 667900398 is about 874.1190144557.

The spelling of 667900398 in words is "six hundred sixty-seven million, nine hundred thousand, three hundred ninety-eight".