640881848490 has 32 divisors (see below), whose sum is σ = 1656433086336. Its totient is φ = 157755531840.

The previous prime is 640881848413. The next prime is 640881848521. The reversal of 640881848490 is 94848188046.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 821643006 + ... + 821643785.

It is an arithmetic number, because the mean of its divisors is an integer number (51763533948).

Almost surely, 2^640881848490 is an apocalyptic number.

640881848490 is an abundant number, since it is smaller than the sum of its proper divisors (1015551237846).

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

640881848490 is a wasteful number, since it uses less digits than its factorization.

640881848490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1643286814.

The product of its (nonzero) digits is 14155776, while the sum is 60.

The spelling of 640881848490 in words is "six hundred forty billion, eight hundred eighty-one million, eight hundred forty-eight thousand, four hundred ninety".