667756632 has 64 divisors (see below), whose sum is σ = 1721047680. Its totient is φ = 215776512.

The previous prime is 667756619. The next prime is 667756667. The reversal of 667756632 is 236657766.

It is a happy number.

It is a congruent number.

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, 139023 + ... + 143745.

It is an arithmetic number, because the mean of its divisors is an integer number (26891370).

Almost surely, 2^667756632 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 667756632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (860523840).

667756632 is an abundant number, since it is smaller than the sum of its proper divisors (1053291048).

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

667756632 is a wasteful number, since it uses less digits than its factorization.

667756632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4912 (or 4908 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 48.

The square root of 667756632 is about 25840.9874424334. The cubic root of 667756632 is about 874.0562917242.

The spelling of 667756632 in words is "six hundred sixty-seven million, seven hundred fifty-six thousand, six hundred thirty-two".