640302442 has 16 divisors (see below), whose sum is σ = 1034853120. Its totient is φ = 295376112.

The previous prime is 640302431. The next prime is 640302457. The reversal of 640302442 is 244203046.

640302442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60159 + ... + 69997.

It is an arithmetic number, because the mean of its divisors is an integer number (64678320).

Almost surely, 2^640302442 is an apocalyptic number.

640302442 is a deficient number, since it is larger than the sum of its proper divisors (394550678).

640302442 is a wasteful number, since it uses less digits than its factorization.

640302442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12357.

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 640302442 is about 25304.1981101951. The cubic root of 640302442 is about 861.9096028718.

Adding to 640302442 its reverse (244203046), we get a palindrome (884505488).

The spelling of 640302442 in words is "six hundred forty million, three hundred two thousand, four hundred forty-two".