670218138 has 20 divisors (see below), whose sum is σ = 1501785450. Its totient is φ = 223405992.

The previous prime is 670218121. The next prime is 670218161. The reversal of 670218138 is 831812076.

It can be written as a sum of positive squares in only one way, i.e., 659308329 + 10909809 = 25677^2 + 3303^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2068413 + ... + 2068736.

Almost surely, 2^670218138 is an apocalyptic number.

670218138 is an abundant number, since it is smaller than the sum of its proper divisors (831567312).

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

670218138 is a wasteful number, since it uses less digits than its factorization.

670218138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4137163 (or 4137154 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 670218138 is about 25888.5715712551. The cubic root of 670218138 is about 875.1289662424.

The spelling of 670218138 in words is "six hundred seventy million, two hundred eighteen thousand, one hundred thirty-eight".