981656644 has 12 divisors (see below), whose sum is σ = 1720456444. Its totient is φ = 490097664.

The previous prime is 981656639. The next prime is 981656659. The reversal of 981656644 is 446656189.

It can be written as a sum of positive squares in 2 ways, for example, as 586124100 + 395532544 = 24210^2 + 19888^2 .

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

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, 179637 + ... + 185020.

Almost surely, 2^981656644 is an apocalyptic number.

It is an amenable number.

981656644 is a deficient number, since it is larger than the sum of its proper divisors (738799800).

981656644 is a wasteful number, since it uses less digits than its factorization.

981656644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365334 (or 365332 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 49.

The square root of 981656644 is about 31331.4002878901. The cubic root of 981656644 is about 993.8477757571.

The spelling of 981656644 in words is "nine hundred eighty-one million, six hundred fifty-six thousand, six hundred forty-four".