640303554 has 32 divisors (see below), whose sum is σ = 1403677440. Its totient is φ = 193107600.

The previous prime is 640303549. The next prime is 640303579. The reversal of 640303554 is 455303046.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 9064 + ... + 36915.

It is an arithmetic number, because the mean of its divisors is an integer number (43864920).

Almost surely, 2^640303554 is an apocalyptic number.

640303554 is an abundant number, since it is smaller than the sum of its proper divisors (763373886).

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

640303554 is a wasteful number, since it uses less digits than its factorization.

640303554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46206.

The product of its (nonzero) digits is 21600, while the sum is 30.

The square root of 640303554 is about 25304.2200828241. The cubic root of 640303554 is about 861.9101018251.

The spelling of 640303554 in words is "six hundred forty million, three hundred three thousand, five hundred fifty-four".