667643460 has 96 divisors (see below), whose sum is σ = 2082834432. Its totient is φ = 158401920.

The previous prime is 667643453. The next prime is 667643461. The reversal of 667643460 is 64346766.

It is not an unprimeable number, because it can be changed into a prime (667643461) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20259 + ... + 41781.

It is an arithmetic number, because the mean of its divisors is an integer number (21696192).

Almost surely, 2^667643460 is an apocalyptic number.

667643460 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667643460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1041417216).

667643460 is an abundant number, since it is smaller than the sum of its proper divisors (1415190972).

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

667643460 is a wasteful number, since it uses less digits than its factorization.

667643460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21593 (or 21591 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 42.

The square root of 667643460 is about 25838.7975726426. The cubic root of 667643460 is about 874.0069103165.

The spelling of 667643460 in words is "six hundred sixty-seven million, six hundred forty-three thousand, four hundred sixty".