667747976 has 64 divisors (see below), whose sum is σ = 1471841280. Its totient is φ = 278046720.

The previous prime is 667747973. The next prime is 667747979. The reversal of 667747976 is 679747766.

It is an interprime number because it is at equal distance from previous prime (667747973) and next prime (667747979).

It is not an unprimeable number, because it can be changed into a prime (667747973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 773321 + ... + 774183.

It is an arithmetic number, because the mean of its divisors is an integer number (22997520).

Almost surely, 2^667747976 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 667747976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (735920640).

667747976 is an abundant number, since it is smaller than the sum of its proper divisors (804093304).

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

667747976 is a wasteful number, since it uses less digits than its factorization.

667747976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254 (or 1250 counting only the distinct ones).

The product of its digits is 18670176, while the sum is 59.

The square root of 667747976 is about 25840.8199560308. The cubic root of 667747976 is about 874.0525149670.

The spelling of 667747976 in words is "six hundred sixty-seven million, seven hundred forty-seven thousand, nine hundred seventy-six".