640041858 has 32 divisors (see below), whose sum is σ = 1426576320. Its totient is φ = 212708160.

The previous prime is 640041839. The next prime is 640041859. The reversal of 640041858 is 858140046.

640041858 is a `hidden beast` number, since 640 + 0 + 4 + 1 + 8 + 5 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (640041859) 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 15 ways as a sum of consecutive naturals, for example, 613 + ... + 35783.

It is an arithmetic number, because the mean of its divisors is an integer number (44580510).

Almost surely, 2^640041858 is an apocalyptic number.

640041858 is an abundant number, since it is smaller than the sum of its proper divisors (786534462).

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

640041858 is a wasteful number, since it uses less digits than its factorization.

640041858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35519 (or 35513 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 640041858 is about 25299.0485591850. The cubic root of 640041858 is about 861.7926631714.

The spelling of 640041858 in words is "six hundred forty million, forty-one thousand, eight hundred fifty-eight".