667593990 has 96 divisors (see below), whose sum is σ = 2047758336. Its totient is φ = 147666240.

The previous prime is 667593977. The next prime is 667594001. The reversal of 667593990 is 99395766.

667593990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2439 + ... + 36621.

It is an arithmetic number, because the mean of its divisors is an integer number (21330816).

Almost surely, 2^667593990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667593990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1023879168).

667593990 is an abundant number, since it is smaller than the sum of its proper divisors (1380164346).

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

667593990 is a wasteful number, since it uses less digits than its factorization.

667593990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34234 (or 34231 counting only the distinct ones).

The product of its (nonzero) digits is 2755620, while the sum is 54.

The square root of 667593990 is about 25837.8402735213. The cubic root of 667593990 is about 873.9853228513.

The spelling of 667593990 in words is "six hundred sixty-seven million, five hundred ninety-three thousand, nine hundred ninety".