640260142 has 8 divisors (see below), whose sum is σ = 967721832. Its totient is φ = 317686200.

The previous prime is 640260139. The next prime is 640260191. The reversal of 640260142 is 241062046.

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

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 3 ways as a sum of consecutive naturals, for example, 1221609 + ... + 1222132.

It is an arithmetic number, because the mean of its divisors is an integer number (120965229).

Almost surely, 2^640260142 is an apocalyptic number.

640260142 is a deficient number, since it is larger than the sum of its proper divisors (327461690).

640260142 is a wasteful number, since it uses less digits than its factorization.

640260142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2443874.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 640260142 is about 25303.3622667028. The cubic root of 640260142 is about 861.8906224772.

The spelling of 640260142 in words is "six hundred forty million, two hundred sixty thousand, one hundred forty-two".