667727720 has 64 divisors (see below), whose sum is σ = 1710253440. Its totient is φ = 232249600.

The previous prime is 667727713. The next prime is 667727771. The reversal of 667727720 is 27727766.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 22871 + ... + 43110.

It is an arithmetic number, because the mean of its divisors is an integer number (26722710).

Almost surely, 2^667727720 is an apocalyptic number.

It is an amenable number.

667727720 is an abundant number, since it is smaller than the sum of its proper divisors (1042525720).

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

667727720 is a wasteful number, since it uses less digits than its factorization.

667727720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66026 (or 66022 counting only the distinct ones).

The product of its (nonzero) digits is 345744, while the sum is 44.

The square root of 667727720 is about 25840.4280150310. The cubic root of 667727720 is about 874.0436768088.

The spelling of 667727720 in words is "six hundred sixty-seven million, seven hundred twenty-seven thousand, seven hundred twenty".