667403988 has 24 divisors (see below), whose sum is σ = 1583672160. Its totient is φ = 218697120.

The previous prime is 667403983. The next prime is 667403993. The reversal of 667403988 is 889304766.

It is an interprime number because it is at equal distance from previous prime (667403983) and next prime (667403993).

It is a self number, because there is not a number n which added to its sum of digits gives 667403988.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667403981) 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 7 ways as a sum of consecutive naturals, for example, 470623 + ... + 472038.

It is an arithmetic number, because the mean of its divisors is an integer number (65986340).

Almost surely, 2^667403988 is an apocalyptic number.

It is an amenable number.

667403988 is an abundant number, since it is smaller than the sum of its proper divisors (916268172).

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

667403988 is a wasteful number, since it uses less digits than its factorization.

667403988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942727 (or 942725 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 51.

The square root of 667403988 is about 25834.1631952730. The cubic root of 667403988 is about 873.9024008368.

The spelling of 667403988 in words is "six hundred sixty-seven million, four hundred three thousand, nine hundred eighty-eight".