6278421644 has 12 divisors (see below), whose sum is σ = 11986077768. Its totient is φ = 2853828000.

The previous prime is 6278421631. The next prime is 6278421649. The reversal of 6278421644 is 4461248726.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 142691401 = 6278421644 / (6 + 2 + 7 + 8 + 4 + 2 + 1 + 6 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 6278421595 and 6278421604.

It is not an unprimeable number, because it can be changed into a prime (6278421649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71345657 + ... + 71345744.

It is an arithmetic number, because the mean of its divisors is an integer number (998839814).

Almost surely, 2^6278421644 is an apocalyptic number.

It is an amenable number.

6278421644 is a deficient number, since it is larger than the sum of its proper divisors (5707656124).

6278421644 is a wasteful number, since it uses less digits than its factorization.

6278421644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142691416 (or 142691414 counting only the distinct ones).

The product of its digits is 516096, while the sum is 44.

The square root of 6278421644 is about 79236.4918708546. The cubic root of 6278421644 is about 1844.8036937361.

The spelling of 6278421644 in words is "six billion, two hundred seventy-eight million, four hundred twenty-one thousand, six hundred forty-four".