6440263876 has 12 divisors (see below), whose sum is σ = 11279160508. Its totient is φ = 3217646592.

The previous prime is 6440263777. The next prime is 6440263909. The reversal of 6440263876 is 6783620446.

It can be written as a sum of positive squares in 2 ways, for example, as 6371870976 + 68392900 = 79824^2 + 8270^2 .

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 615501 + ... + 625876.

Almost surely, 2^6440263876 is an apocalyptic number.

It is an amenable number.

6440263876 is a deficient number, since it is larger than the sum of its proper divisors (4838896632).

6440263876 is a wasteful number, since it uses less digits than its factorization.

6440263876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242678 (or 1242676 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 46.

The square root of 6440263876 is about 80251.2546693197. The cubic root of 6440263876 is about 1860.5209043217.

The spelling of 6440263876 in words is "six billion, four hundred forty million, two hundred sixty-three thousand, eight hundred seventy-six".