640616442 has 8 divisors (see below), whose sum is σ = 1281232896. Its totient is φ = 213538812.

The previous prime is 640616429. The next prime is 640616461. The reversal of 640616442 is 244616046.

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

640616442 is an admirable number.

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 3 ways as a sum of consecutive naturals, for example, 53384698 + ... + 53384709.

It is an arithmetic number, because the mean of its divisors is an integer number (160154112).

Almost surely, 2^640616442 is an apocalyptic number.

640616442 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.

640616442 is a wasteful number, since it uses less digits than its factorization.

640616442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106769412.

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 640616442 is about 25310.4018537834. The cubic root of 640616442 is about 862.0504713998.

The spelling of 640616442 in words is "six hundred forty million, six hundred sixteen thousand, four hundred forty-two".