9787816656 has 40 divisors (see below), whose sum is σ = 28094660160. Its totient is φ = 3262605408.

The previous prime is 9787816613. The next prime is 9787816663. The reversal of 9787816656 is 6566187879.

It is a junction number, because it is equal to n+sod(n) for n = 9787816593 and 9787816602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11328060 + ... + 11328923.

It is an arithmetic number, because the mean of its divisors is an integer number (702366504).

Almost surely, 2^9787816656 is an apocalyptic number.

It is an amenable number.

9787816656 is an abundant number, since it is smaller than the sum of its proper divisors (18306843504).

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

9787816656 is a wasteful number, since it uses less digits than its factorization.

9787816656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22657000 (or 22656988 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 63.

The square root of 9787816656 is about 98933.3950493967. The cubic root of 9787816656 is about 2139.0877889256.

The spelling of 9787816656 in words is "nine billion, seven hundred eighty-seven million, eight hundred sixteen thousand, six hundred fifty-six".