667705984 has 32 divisors (see below), whose sum is σ = 1451125440. Its totient is φ = 303502080.

The previous prime is 667705937. The next prime is 667706029. The reversal of 667705984 is 489507766.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235704 + ... + 238519.

It is an arithmetic number, because the mean of its divisors is an integer number (45347670).

Almost surely, 2^667705984 is an apocalyptic number.

667705984 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

667705984 is an abundant number, since it is smaller than the sum of its proper divisors (783419456).

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

667705984 is a wasteful number, since it uses less digits than its factorization.

667705984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474248 (or 474236 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 52.

The square root of 667705984 is about 25840.0074303395. The cubic root of 667705984 is about 874.0341926938.

The spelling of 667705984 in words is "six hundred sixty-seven million, seven hundred five thousand, nine hundred eighty-four".