9977681 has 8 divisors (see below), whose sum is σ = 11431680. Its totient is φ = 8530848.

The previous prime is 9977659. The next prime is 9977683. The reversal of 9977681 is 1867799.

9977681 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9977681 is a prime.

It is a super-2 number, since 2×9977681² = 199108236275522, which contains 22 as substring.

It is a Duffinian number.

9977681 is strictly pandigital in base 8.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9977683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1640 + ... + 4758.

It is an arithmetic number, because the mean of its divisors is an integer number (1428960).

Almost surely, 2^9977681 is an apocalyptic number.

It is an amenable number.

9977681 is a deficient number, since it is larger than the sum of its proper divisors (1453999).

9977681 is a wasteful number, since it uses less digits than its factorization.

9977681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3583.

The product of its digits is 190512, while the sum is 47.

The square root of 9977681 is about 3158.7467451507. The cubic root of 9977681 is about 215.2830668506.

The spelling of 9977681 in words is "nine million, nine hundred seventy-seven thousand, six hundred eighty-one".