6381646776 has 64 divisors (see below), whose sum is σ = 17744294400. Its totient is φ = 2125116000.

The previous prime is 6381646771. The next prime is 6381646783. The reversal of 6381646776 is 6776461836.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6381646771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212961 + ... + 241071.

It is an arithmetic number, because the mean of its divisors is an integer number (277254600).

Almost surely, 2^6381646776 is an apocalyptic number.

It is an amenable number.

6381646776 is an abundant number, since it is smaller than the sum of its proper divisors (11362647624).

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

6381646776 is a wasteful number, since it uses less digits than its factorization.

6381646776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29177 (or 29167 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 54.

The square root of 6381646776 is about 79885.2099953427. The cubic root of 6381646776 is about 1854.8590817652.

It can be divided in two parts, 63816 and 46776, that added together give a cube (110592 = 48³).

The spelling of 6381646776 in words is "six billion, three hundred eighty-one million, six hundred forty-six thousand, seven hundred seventy-six".