667907856 has 480 divisors, whose sum is σ = 2547836928. Its totient is φ = 164229120.

The previous prime is 667907827. The next prime is 667907873. The reversal of 667907856 is 658709766.

It is a happy number.

It is a super-2 number, since 2×667907856² = 892201808213033472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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 95 ways as a sum of consecutive naturals, for example, 6885600 + ... + 6885696.

Almost surely, 2^667907856 is an apocalyptic number.

667907856 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667907856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1273918464).

667907856 is an abundant number, since it is smaller than the sum of its proper divisors (1879929072).

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

667907856 is a wasteful number, since it uses less digits than its factorization.

667907856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 54.

The square root of 667907856 is about 25843.9133259652. The cubic root of 667907856 is about 874.1222680124.

The spelling of 667907856 in words is "six hundred sixty-seven million, nine hundred seven thousand, eight hundred fifty-six".