640806060 has 24 divisors (see below), whose sum is σ = 1794257136. Its totient is φ = 170881600.

The previous prime is 640806043. The next prime is 640806091. The reversal of 640806060 is 60608046.

It is a happy number.

640806060 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 5339991 + ... + 5340110.

It is an arithmetic number, because the mean of its divisors is an integer number (74760714).

Almost surely, 2^640806060 is an apocalyptic number.

640806060 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640806060 is an abundant number, since it is smaller than the sum of its proper divisors (1153451076).

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

640806060 is a wasteful number, since it uses less digits than its factorization.

640806060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10680113 (or 10680111 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 640806060 is about 25314.1474278712. The cubic root of 640806060 is about 862.1355166523.

The spelling of 640806060 in words is "six hundred forty million, eight hundred six thousand, sixty".