9776887890 has 128 divisors (see below), whose sum is σ = 29607524352. Its totient is φ = 2007045120.

The previous prime is 9776887859. The next prime is 9776887891. The reversal of 9776887890 is 987886779.

It is not an unprimeable number, because it can be changed into a prime (9776887891) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 166234 + ... + 217226.

It is an arithmetic number, because the mean of its divisors is an integer number (231308784).

Almost surely, 2^9776887890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9776887890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14803762176).

9776887890 is an abundant number, since it is smaller than the sum of its proper divisors (19830636462).

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

9776887890 is a wasteful number, since it uses less digits than its factorization.

9776887890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51104.

The product of its (nonzero) digits is 85349376, while the sum is 69.

The square root of 9776887890 is about 98878.1466755926. The cubic root of 9776887890 is about 2138.2913465383.

The spelling of 9776887890 in words is "nine billion, seven hundred seventy-six million, eight hundred eighty-seven thousand, eight hundred ninety".