667811952 has 150 divisors (see below), whose sum is σ = 2054377688. Its totient is φ = 209392128.

The previous prime is 667811897. The next prime is 667811953. The reversal of 667811952 is 259118766.

It is a junction number, because it is equal to n+sod(n) for n = 667811898 and 667811907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667811953) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 373653 + ... + 375435.

Almost surely, 2^667811952 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 667811952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1027188844).

667811952 is an abundant number, since it is smaller than the sum of its proper divisors (1386565736).

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

667811952 is a wasteful number, since it uses less digits than its factorization.

667811952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1837 (or 1805 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 667811952 is about 25842.0578127981. The cubic root of 667811952 is about 874.0804279921.

The spelling of 667811952 in words is "six hundred sixty-seven million, eight hundred eleven thousand, nine hundred fifty-two".