640801404580 has 48 divisors (see below), whose sum is σ = 1360536637824. Its totient is φ = 253497841920.

The previous prime is 640801404563. The next prime is 640801404583. The reversal of 640801404580 is 85404108046.

It is a super-2 number, since 2×640801404580² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640801404583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1363279 + ... + 1772041.

It is an arithmetic number, because the mean of its divisors is an integer number (28344513288).

Almost surely, 2^640801404580 is an apocalyptic number.

It is an amenable number.

640801404580 is an abundant number, since it is smaller than the sum of its proper divisors (719735233244).

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

640801404580 is a wasteful number, since it uses less digits than its factorization.

640801404580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409636 (or 409634 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 40.

The spelling of 640801404580 in words is "six hundred forty billion, eight hundred one million, four hundred four thousand, five hundred eighty".