6403872064 has 14 divisors (see below), whose sum is σ = 12707683754. Its totient is φ = 3201936000.

The previous prime is 6403872053. The next prime is 6403872067. The reversal of 6403872064 is 4602783046.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6145305664 + 258566400 = 78392^2 + 16080^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6403872067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50030187 + ... + 50030314.

Almost surely, 2^6403872064 is an apocalyptic number.

6403872064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

6403872064 is a deficient number, since it is larger than the sum of its proper divisors (6303811690).

6403872064 is a wasteful number, since it uses less digits than its factorization.

6403872064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100060513 (or 100060503 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 40.

The square root of 6403872064 is about 80024.1967407359. The cubic root of 6403872064 is about 1857.0098856477.

The spelling of 6403872064 in words is "six billion, four hundred three million, eight hundred seventy-two thousand, sixty-four".