640345176 has 160 divisors (see below), whose sum is σ = 1873428480. Its totient is φ = 204120000.

The previous prime is 640345117. The next prime is 640345183. The reversal of 640345176 is 671543046.

It is a happy number.

640345176 is a `hidden beast` number, since 640 + 3 + 4 + 5 + 1 + 7 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 640345176.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2551051 + ... + 2551301.

It is an arithmetic number, because the mean of its divisors is an integer number (11708928).

Almost surely, 2^640345176 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 640345176, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (936714240).

640345176 is an abundant number, since it is smaller than the sum of its proper divisors (1233083304).

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

640345176 is a wasteful number, since it uses less digits than its factorization.

640345176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427 (or 414 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 640345176 is about 25305.0425014462. The cubic root of 640345176 is about 861.9287771574.

The spelling of 640345176 in words is "six hundred forty million, three hundred forty-five thousand, one hundred seventy-six".