1980298644 has 12 divisors (see below), whose sum is σ = 4620696864. Its totient is φ = 660099544.

The previous prime is 1980298637. The next prime is 1980298657. The reversal of 1980298644 is 4468920891.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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, 82512432 + ... + 82512455.

It is an arithmetic number, because the mean of its divisors is an integer number (385058072).

Almost surely, 2^1980298644 is an apocalyptic number.

It is an amenable number.

1980298644 is an abundant number, since it is smaller than the sum of its proper divisors (2640398220).

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

1980298644 is a wasteful number, since it uses less digits than its factorization.

1980298644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165024894 (or 165024892 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 51.

The square root of 1980298644 is about 44500.5465584413. The cubic root of 1980298644 is about 1255.7703653710.

The spelling of 1980298644 in words is "one billion, nine hundred eighty million, two hundred ninety-eight thousand, six hundred forty-four".