640262016 has 128 divisors (see below), whose sum is σ = 1900260000. Its totient is φ = 212226048.

The previous prime is 640261997. The next prime is 640262033. The reversal of 640262016 is 610262046.

It is a happy number.

640262016 is a `hidden beast` number, since 640 + 2 + 6 + 2 + 0 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (27).

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 15 ways as a sum of consecutive naturals, for example, 791020 + ... + 791828.

Almost surely, 2^640262016 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 640262016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (950130000).

640262016 is an abundant number, since it is smaller than the sum of its proper divisors (1259997984).

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

640262016 is a wasteful number, since it uses less digits than its factorization.

640262016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061 (or 1043 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 640262016 is about 25303.3992973276. The cubic root of 640262016 is about 861.8914633757.

The spelling of 640262016 in words is "six hundred forty million, two hundred sixty-two thousand, sixteen".