6400400060 has 12 divisors (see below), whose sum is σ = 13440840168. Its totient is φ = 2560160016.

The previous prime is 6400400033. The next prime is 6400400087. The reversal of 6400400060 is 600040046.

It is an interprime number because it is at equal distance from previous prime (6400400033) and next prime (6400400087).

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 320020003 = 6400400060 / (6 + 4 + 0 + 0 + 4 + 0 + 0 + 0 + 6 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160009982 + ... + 160010021.

It is an arithmetic number, because the mean of its divisors is an integer number (1120070014).

Almost surely, 2^6400400060 is an apocalyptic number.

It is an amenable number.

6400400060 is an abundant number, since it is smaller than the sum of its proper divisors (7040440108).

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

6400400060 is a wasteful number, since it uses less digits than its factorization.

6400400060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320020012 (or 320020010 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 6400400060 is about 80002.5003359270. The cubic root of 6400400060 is about 1856.6742183480.

The spelling of 6400400060 in words is "six billion, four hundred million, four hundred thousand, sixty".