640422546 has 8 divisors (see below), whose sum is σ = 1280845104. Its totient is φ = 213474180.

The previous prime is 640422539. The next prime is 640422547. The reversal of 640422546 is 645224046.

It is a sphenic number, since it is the product of 3 distinct primes.

640422546 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (640422547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53368540 + ... + 53368551.

It is an arithmetic number, because the mean of its divisors is an integer number (160105638).

Almost surely, 2^640422546 is an apocalyptic number.

640422546 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

640422546 is a wasteful number, since it uses less digits than its factorization.

640422546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106737096.

The product of its (nonzero) digits is 46080, while the sum is 33.

The square root of 640422546 is about 25306.5712019625. The cubic root of 640422546 is about 861.9634900728.

The spelling of 640422546 in words is "six hundred forty million, four hundred twenty-two thousand, five hundred forty-six".