640926170 has 8 divisors (see below), whose sum is σ = 1153667124. Its totient is φ = 256370464.

The previous prime is 640926161. The next prime is 640926193. The reversal of 640926170 is 71629046.

640926170 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 640545481 + 380689 = 25309^2 + 617^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 640926170.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32046299 + ... + 32046318.

Almost surely, 2^640926170 is an apocalyptic number.

640926170 is a deficient number, since it is larger than the sum of its proper divisors (512740954).

640926170 is a wasteful number, since it uses less digits than its factorization.

640926170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64092624.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 640926170 is about 25316.5197055203. The cubic root of 640926170 is about 862.1893783089.

The spelling of 640926170 in words is "six hundred forty million, nine hundred twenty-six thousand, one hundred seventy".