6644763678 has 48 divisors (see below), whose sum is σ = 15992344080. Its totient is φ = 1833035904.

The previous prime is 6644763677. The next prime is 6644763679. The reversal of 6644763678 is 8763674466.

It is an interprime number because it is at equal distance from previous prime (6644763677) and next prime (6644763679).

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6644763673) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 381151 + ... + 398202.

It is an arithmetic number, because the mean of its divisors is an integer number (333173835).

Almost surely, 2^6644763678 is an apocalyptic number.

6644763678 is an abundant number, since it is smaller than the sum of its proper divisors (9347580402).

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

6644763678 is a wasteful number, since it uses less digits than its factorization.

6644763678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779401 (or 779394 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 57.

The square root of 6644763678 is about 81515.4198786953. The cubic root of 6644763678 is about 1880.0086462180.

The spelling of 6644763678 in words is "six billion, six hundred forty-four million, seven hundred sixty-three thousand, six hundred seventy-eight".