671280444 has 18 divisors (see below), whose sum is σ = 1696847880. Its totient is φ = 223760136.

The previous prime is 671280419. The next prime is 671280451. The reversal of 671280444 is 444082176.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 18646679 = 671280444 / (6 + 7 + 1 + 2 + 8 + 0 + 4 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 671280399 and 671280408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9323304 + ... + 9323375.

Almost surely, 2^671280444 is an apocalyptic number.

It is an amenable number.

671280444 is an abundant number, since it is smaller than the sum of its proper divisors (1025567436).

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

671280444 is a wasteful number, since it uses less digits than its factorization.

671280444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18646689 (or 18646684 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 671280444 is about 25909.0803387538. The cubic root of 671280444 is about 875.5910864382.

The spelling of 671280444 in words is "six hundred seventy-one million, two hundred eighty thousand, four hundred forty-four".