640086016 has 78 divisors (see below), whose sum is σ = 1340178656. Its totient is φ = 305356800.

The previous prime is 640086001. The next prime is 640086049. The reversal of 640086016 is 610680046.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9015261 + ... + 9015331.

Almost surely, 2^640086016 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 640086016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (670089328).

640086016 is an abundant number, since it is smaller than the sum of its proper divisors (700092640).

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

640086016 is an frugal number, since it uses more digits than its factorization.

640086016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 640086016 is about 25299.9212646996. The cubic root of 640086016 is about 861.8124817529.

Multiplying 640086016 by its sum of digits (31), we get a square (19842666496 = 140864²).

640086016 divided by its sum of digits (31) gives a square (20647936 = 4544²).

It can be divided in two parts, 6400 and 86016, that added together give a square (92416 = 304²).

The spelling of 640086016 in words is "six hundred forty million, eighty-six thousand, sixteen".