6408515440 has 40 divisors (see below), whose sum is σ = 15302502720. Its totient is φ = 2494123776.

The previous prime is 6408515413. The next prime is 6408515447. The reversal of 6408515440 is 445158046.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 6408515440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6408515447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1079560 + ... + 1085479.

It is an arithmetic number, because the mean of its divisors is an integer number (382562568).

Almost surely, 2^6408515440 is an apocalyptic number.

It is an amenable number.

6408515440 is an abundant number, since it is smaller than the sum of its proper divisors (8893987280).

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

6408515440 is a wasteful number, since it uses less digits than its factorization.

6408515440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165089 (or 2165083 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 37.

The square root of 6408515440 is about 80053.2038084673. The cubic root of 6408515440 is about 1857.4586095754.

The spelling of 6408515440 in words is "six billion, four hundred eight million, five hundred fifteen thousand, four hundred forty".