640622442 has 16 divisors (see below), whose sum is σ = 1282054752. Its totient is φ = 213405840.

The previous prime is 640622431. The next prime is 640622461. The reversal of 640622442 is 244226046.

It is a super-2 number, since 2×640622442² = 820794226388086728, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23208 + ... + 42659.

It is an arithmetic number, because the mean of its divisors is an integer number (80128422).

Almost surely, 2^640622442 is an apocalyptic number.

640622442 is an abundant number, since it is smaller than the sum of its proper divisors (641432310).

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

640622442 is a wasteful number, since it uses less digits than its factorization.

640622442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67493.

The product of its (nonzero) digits is 18432, while the sum is 30.

The square root of 640622442 is about 25310.5203818491. The cubic root of 640622442 is about 862.0531627069.

Adding to 640622442 its reverse (244226046), we get a palindrome (884848488).

The spelling of 640622442 in words is "six hundred forty million, six hundred twenty-two thousand, four hundred forty-two".