640177160 has 96 divisors (see below), whose sum is σ = 1774220760. Its totient is φ = 206567424.

The previous prime is 640177141. The next prime is 640177169. The reversal of 640177160 is 61771046.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 639988804 + 188356 = 25298^2 + 434^2 .

It is not an unprimeable number, because it can be changed into a prime (640177169) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23714 + ... + 42926.

Almost surely, 2^640177160 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640177160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (887110380).

640177160 is an abundant number, since it is smaller than the sum of its proper divisors (1134043600).

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

640177160 is a wasteful number, since it uses less digits than its factorization.

640177160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19255 (or 19244 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 640177160 is about 25301.7224710098. The cubic root of 640177160 is about 861.8533852705.

The spelling of 640177160 in words is "six hundred forty million, one hundred seventy-seven thousand, one hundred sixty".