667741968 has 50 divisors (see below), whose sum is σ = 1932642734. Its totient is φ = 222580224.

The previous prime is 667741967. The next prime is 667742027. The reversal of 667741968 is 869147766.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 611671824 + 56070144 = 24732^2 + 7488^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (667741967) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 256321 + ... + 258912.

Almost surely, 2^667741968 is an apocalyptic number.

It is an amenable number.

667741968 is an abundant number, since it is smaller than the sum of its proper divisors (1264900766).

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

667741968 is a wasteful number, since it uses less digits than its factorization.

667741968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515253 (or 515238 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 667741968 is about 25840.7037055882. The cubic root of 667741968 is about 874.0498935572.

The spelling of 667741968 in words is "six hundred sixty-seven million, seven hundred forty-one thousand, nine hundred sixty-eight".