667999390 has 16 divisors (see below), whose sum is σ = 1203899760. Its totient is φ = 266866240.

The previous prime is 667999363. The next prime is 667999403. The reversal of 667999390 is 93999766.

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 7 ways as a sum of consecutive naturals, for example, 33196 + ... + 49375.

It is an arithmetic number, because the mean of its divisors is an integer number (75243735).

Almost surely, 2^667999390 is an apocalyptic number.

667999390 is a deficient number, since it is larger than the sum of its proper divisors (535900370).

667999390 is a wasteful number, since it uses less digits than its factorization.

667999390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83387.

The product of its (nonzero) digits is 4960116, while the sum is 58.

The square root of 667999390 is about 25845.6841658332. The cubic root of 667999390 is about 874.1621977982.

The spelling of 667999390 in words is "six hundred sixty-seven million, nine hundred ninety-nine thousand, three hundred ninety".