667758380 has 24 divisors (see below), whose sum is σ = 1413339648. Its totient is φ = 264999168.

The previous prime is 667758359. The next prime is 667758389. The reversal of 667758380 is 83857766.

It is not an unprimeable number, because it can be changed into a prime (667758389) 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, 128909 + ... + 133988.

It is an arithmetic number, because the mean of its divisors is an integer number (58889152).

Almost surely, 2^667758380 is an apocalyptic number.

It is an amenable number.

667758380 is an abundant number, since it is smaller than the sum of its proper divisors (745581268).

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

667758380 is a wasteful number, since it uses less digits than its factorization.

667758380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263033 (or 263031 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 50.

The square root of 667758380 is about 25841.0212646482. The cubic root of 667758380 is about 874.0570544018.

The spelling of 667758380 in words is "six hundred sixty-seven million, seven hundred fifty-eight thousand, three hundred eighty".