6438635764 has 24 divisors (see below), whose sum is σ = 12297146400. Its totient is φ = 2925413280.

The previous prime is 6438635759. The next prime is 6438635789. The reversal of 6438635764 is 4675368346.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 78442 + ... + 137950.

It is an arithmetic number, because the mean of its divisors is an integer number (512381100).

Almost surely, 2^6438635764 is an apocalyptic number.

It is an amenable number.

6438635764 is a deficient number, since it is larger than the sum of its proper divisors (5858510636).

6438635764 is a wasteful number, since it uses less digits than its factorization.

6438635764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61983 (or 61981 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 52.

The square root of 6438635764 is about 80241.1101867366. The cubic root of 6438635764 is about 1860.3641099335.

The spelling of 6438635764 in words is "six billion, four hundred thirty-eight million, six hundred thirty-five thousand, seven hundred sixty-four".