667421004 has 24 divisors (see below), whose sum is σ = 1560924400. Its totient is φ = 221958144.

The previous prime is 667420991. The next prime is 667421023. The reversal of 667421004 is 400124766.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59029 + ... + 69420.

Almost surely, 2^667421004 is an apocalyptic number.

It is an amenable number.

667421004 is an abundant number, since it is smaller than the sum of its proper divisors (893503396).

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

667421004 is a wasteful number, since it uses less digits than its factorization.

667421004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128889 (or 128887 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 667421004 is about 25834.4925245301. The cubic root of 667421004 is about 873.9098277212.

The spelling of 667421004 in words is "six hundred sixty-seven million, four hundred twenty-one thousand, four".