6438964428 has 72 divisors (see below), whose sum is σ = 18177523728. Its totient is φ = 1981215936.

The previous prime is 6438964417. The next prime is 6438964439. The reversal of 6438964428 is 8244698346.

It is an interprime number because it is at equal distance from previous prime (6438964417) and next prime (6438964439).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 242151 + ... + 267422.

Almost surely, 2^6438964428 is an apocalyptic number.

It is an amenable number.

6438964428 is an abundant number, since it is smaller than the sum of its proper divisors (11738559300).

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

6438964428 is a wasteful number, since it uses less digits than its factorization.

6438964428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509605 (or 509591 counting only the distinct ones).

The product of its digits is 7962624, while the sum is 54.

The square root of 6438964428 is about 80243.1581382488. The cubic root of 6438964428 is about 1860.3957638598.

The spelling of 6438964428 in words is "six billion, four hundred thirty-eight million, nine hundred sixty-four thousand, four hundred twenty-eight".