667598648 has 8 divisors (see below), whose sum is σ = 1251747480. Its totient is φ = 333799320.

The previous prime is 667598641. The next prime is 667598681. The reversal of 667598648 is 846895766.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×667598648² = 891375909622855808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667598641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41724908 + ... + 41724923.

It is an arithmetic number, because the mean of its divisors is an integer number (156468435).

Almost surely, 2^667598648 is an apocalyptic number.

It is an amenable number.

667598648 is a deficient number, since it is larger than the sum of its proper divisors (584148832).

667598648 is a wasteful number, since it uses less digits than its factorization.

667598648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83449837 (or 83449833 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 59.

The square root of 667598648 is about 25837.9304124769. The cubic root of 667598648 is about 873.9873555310.

The spelling of 667598648 in words is "six hundred sixty-seven million, five hundred ninety-eight thousand, six hundred forty-eight".