8387280644 has 12 divisors (see below), whose sum is σ = 14918360268. Its totient is φ = 4124892000.

The previous prime is 8387280593. The next prime is 8387280653. The reversal of 8387280644 is 4460827838.

It can be written as a sum of positive squares in 2 ways, for example, as 3734676544 + 4652604100 = 61112^2 + 68210^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8387280592 and 8387280601.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17186807 + ... + 17187294.

It is an arithmetic number, because the mean of its divisors is an integer number (1243196689).

Almost surely, 2^8387280644 is an apocalyptic number.

It is an amenable number.

8387280644 is a deficient number, since it is larger than the sum of its proper divisors (6531079624).

8387280644 is a wasteful number, since it uses less digits than its factorization.

8387280644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34374166 (or 34374164 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 50.

The square root of 8387280644 is about 91582.0978357670. The cubic root of 8387280644 is about 2031.7661709489.

The spelling of 8387280644 in words is "eight billion, three hundred eighty-seven million, two hundred eighty thousand, six hundred forty-four".