640896180 has 24 divisors (see below), whose sum is σ = 1794509472. Its totient is φ = 170905632.

The previous prime is 640896131. The next prime is 640896199. The reversal of 640896180 is 81698046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5340742 + ... + 5340861.

It is an arithmetic number, because the mean of its divisors is an integer number (74771228).

Almost surely, 2^640896180 is an apocalyptic number.

640896180 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640896180 is an abundant number, since it is smaller than the sum of its proper divisors (1153613292).

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

640896180 is a wasteful number, since it uses less digits than its factorization.

640896180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10681615 (or 10681613 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 640896180 is about 25315.9273975891. The cubic root of 640896180 is about 862.1759303415.

The spelling of 640896180 in words is "six hundred forty million, eight hundred ninety-six thousand, one hundred eighty".