667761732 has 90 divisors (see below), whose sum is σ = 1918897134. Its totient is φ = 202340160.

The previous prime is 667761709. The next prime is 667761761. The reversal of 667761732 is 237167766.

667761732 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 491774976 + 175986756 = 22176^2 + 13266^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 30688 + ... + 47720.

Almost surely, 2^667761732 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 667761732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (959448567).

667761732 is an abundant number, since it is smaller than the sum of its proper divisors (1251135402).

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

667761732 is a wasteful number, since it uses less digits than its factorization.

667761732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17071 (or 17049 counting only the distinct ones).

The product of its digits is 444528, while the sum is 45.

The square root of 667761732 is about 25841.0861226845. The cubic root of 667761732 is about 874.0585169240.

The spelling of 667761732 in words is "six hundred sixty-seven million, seven hundred sixty-one thousand, seven hundred thirty-two".