667827720 has 128 divisors (see below), whose sum is σ = 2544134400. Its totient is φ = 152644608.

The previous prime is 667827709. The next prime is 667827733. The reversal of 667827720 is 27728766.

It is a happy number.

667827720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36609 + ... + 51728.

It is an arithmetic number, because the mean of its divisors is an integer number (19876050).

Almost surely, 2^667827720 is an apocalyptic number.

667827720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

667827720 is an abundant number, since it is smaller than the sum of its proper divisors (1876306680).

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

667827720 is a wasteful number, since it uses less digits than its factorization.

667827720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88364 (or 88354 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 45.

The square root of 667827720 is about 25842.3628950605. The cubic root of 667827720 is about 874.0873073697.

The spelling of 667827720 in words is "six hundred sixty-seven million, eight hundred twenty-seven thousand, seven hundred twenty".