640982016 has 132 divisors (see below), whose sum is σ = 1866814872. Its totient is φ = 211820544.

The previous prime is 640982011. The next prime is 640982039. The reversal of 640982016 is 610289046.

640982016 is a `hidden beast` number, since 640 + 9 + 8 + 2 + 0 + 1 + 6 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640982011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1446691 + ... + 1447133.

Almost surely, 2^640982016 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 640982016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (933407436).

640982016 is an abundant number, since it is smaller than the sum of its proper divisors (1225832856).

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

640982016 is a wasteful number, since it uses less digits than its factorization.

640982016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626 (or 605 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 640982016 is about 25317.6226372067. The cubic root of 640982016 is about 862.2144193781.

The spelling of 640982016 in words is "six hundred forty million, nine hundred eighty-two thousand, sixteen".