8421267644 has 24 divisors (see below), whose sum is σ = 14814854208. Its totient is φ = 4188504320.

The previous prime is 8421267637. The next prime is 8421267661. The reversal of 8421267644 is 4467621248.

It is a junction number, because it is equal to n+sod(n) for n = 8421267595 and 8421267604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 687437 + ... + 699579.

It is an arithmetic number, because the mean of its divisors is an integer number (617285592).

Almost surely, 2^8421267644 is an apocalyptic number.

It is an amenable number.

8421267644 is a deficient number, since it is larger than the sum of its proper divisors (6393586564).

8421267644 is a wasteful number, since it uses less digits than its factorization.

8421267644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13045 (or 13043 counting only the distinct ones).

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

The square root of 8421267644 is about 91767.4650625155. The cubic root of 8421267644 is about 2034.5068515888.

The spelling of 8421267644 in words is "eight billion, four hundred twenty-one million, two hundred sixty-seven thousand, six hundred forty-four".