667871904 has 96 divisors (see below), whose sum is σ = 2057844096. Its totient is φ = 185656320.

The previous prime is 667871891. The next prime is 667871933. The reversal of 667871904 is 409178766.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11434 + ... + 38294.

It is an arithmetic number, because the mean of its divisors is an integer number (21435876).

Almost surely, 2^667871904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667871904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1028922048).

667871904 is an abundant number, since it is smaller than the sum of its proper divisors (1389972192).

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

667871904 is a wasteful number, since it uses less digits than its factorization.

667871904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26918 (or 26910 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 48.

The square root of 667871904 is about 25843.2177563089. The cubic root of 667871904 is about 874.1065837093.

The spelling of 667871904 in words is "six hundred sixty-seven million, eight hundred seventy-one thousand, nine hundred four".