9877997789 has 8 divisors (see below), whose sum is σ = 10776716832. Its totient is φ = 8979398640.

The previous prime is 9877997741. The next prime is 9877997807.

9877997789 is nontrivially palindromic in base 10.

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-9877997789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9877997489) 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, 311387 + ... + 341639.

It is an arithmetic number, because the mean of its divisors is an integer number (1347089604).

Almost surely, 2^9877997789 is an apocalyptic number.

It is an amenable number.

9877997789 is a deficient number, since it is larger than the sum of its proper divisors (898719043).

9877997789 is a wasteful number, since it uses less digits than its factorization.

9877997789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59947.

The product of its digits is 1008189504, while the sum is 80.

The square root of 9877997789 is about 99388.1169406081. The cubic root of 9877997789 is about 2145.6372891726.

The spelling of 9877997789 in words is "nine billion, eight hundred seventy-seven million, nine hundred ninety-seven thousand, seven hundred eighty-nine".