667071864 has 24 divisors (see below), whose sum is σ = 1806653160. Its totient is φ = 222357264.

The previous prime is 667071863. The next prime is 667071869. The reversal of 667071864 is 468170766.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667071863) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4632372 + ... + 4632515.

It is an arithmetic number, because the mean of its divisors is an integer number (75277215).

Almost surely, 2^667071864 is an apocalyptic number.

It is an amenable number.

667071864 is an abundant number, since it is smaller than the sum of its proper divisors (1139581296).

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

667071864 is a wasteful number, since it uses less digits than its factorization.

667071864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9264899 (or 9264892 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 667071864 is about 25827.7343954130. The cubic root of 667071864 is about 873.7574151286.

The spelling of 667071864 in words is "six hundred sixty-seven million, seventy-one thousand, eight hundred sixty-four".