99776780 has 48 divisors (see below), whose sum is σ = 215913600. Its totient is φ = 38707200.

The previous prime is 99776759. The next prime is 99776837. The reversal of 99776780 is 8767799.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221996 + ... + 222444.

It is an arithmetic number, because the mean of its divisors is an integer number (4498200).

Almost surely, 2^99776780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99776780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107956800).

99776780 is an abundant number, since it is smaller than the sum of its proper divisors (116136820).

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

99776780 is a wasteful number, since it uses less digits than its factorization.

99776780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770 (or 768 counting only the distinct ones).

The product of its (nonzero) digits is 1333584, while the sum is 53.

The square root of 99776780 is about 9988.8327646427. The cubic root of 99776780 is about 463.8132609143.

It can be divided in two parts, 997 and 76780, that added together give a palindrome (77777).

The spelling of 99776780 in words is "ninety-nine million, seven hundred seventy-six thousand, seven hundred eighty".