8961947644 has 18 divisors (see below), whose sum is σ = 16982626920. Its totient is φ = 4136283216.

The previous prime is 8961947629. The next prime is 8961947689. The reversal of 8961947644 is 4467491698.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6627984 + ... + 6629335.

Almost surely, 2^8961947644 is an apocalyptic number.

It is an amenable number.

8961947644 is a deficient number, since it is larger than the sum of its proper divisors (8020679276).

8961947644 is a wasteful number, since it uses less digits than its factorization.

8961947644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13257349 (or 13257334 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 58.

The square root of 8961947644 is about 94667.5638431665. The cubic root of 8961947644 is about 2077.1481228432.

The spelling of 8961947644 in words is "eight billion, nine hundred sixty-one million, nine hundred forty-seven thousand, six hundred forty-four".