6406521304 has 16 divisors (see below), whose sum is σ = 12131161920. Its totient is φ = 3171544800.

The previous prime is 6406521271. The next prime is 6406521343. The reversal of 6406521304 is 4031256046.

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, 3963624 + ... + 3965239.

It is an arithmetic number, because the mean of its divisors is an integer number (758197620).

Almost surely, 2^6406521304 is an apocalyptic number.

It is an amenable number.

6406521304 is a deficient number, since it is larger than the sum of its proper divisors (5724640616).

6406521304 is a wasteful number, since it uses less digits than its factorization.

6406521304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7928970 (or 7928966 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 6406521304 is about 80040.7477726189. The cubic root of 6406521304 is about 1857.2659279590.

The spelling of 6406521304 in words is "six billion, four hundred six million, five hundred twenty-one thousand, three hundred four".