667371964 has 36 divisors (see below), whose sum is σ = 1380875160. Its totient is φ = 281322720.

The previous prime is 667371959. The next prime is 667371967. The reversal of 667371964 is 469173766.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667371967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15954 + ... + 39865.

Almost surely, 2^667371964 is an apocalyptic number.

It is an amenable number.

667371964 is an abundant number, since it is smaller than the sum of its proper divisors (713503196).

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

667371964 is a wasteful number, since it uses less digits than its factorization.

667371964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55898 (or 55889 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 49.

The square root of 667371964 is about 25833.5433883933. The cubic root of 667371964 is about 873.8884231468. Note that the first 3 decimals are identical.

The spelling of 667371964 in words is "six hundred sixty-seven million, three hundred seventy-one thousand, nine hundred sixty-four".