99771777 has 32 divisors (see below), whose sum is σ = 171468800. Its totient is φ = 56154384.

The previous prime is 99771751. The next prime is 99771779. The reversal of 99771777 is 77717799.

It is not a de Polignac number, because 99771777 - 2⁶ = 99771713 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99771779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8724 + ... + 16602.

It is an arithmetic number, because the mean of its divisors is an integer number (5358400).

Almost surely, 2^99771777 is an apocalyptic number.

It is an amenable number.

99771777 is a deficient number, since it is larger than the sum of its proper divisors (71697023).

99771777 is a wasteful number, since it uses less digits than its factorization.

99771777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7962 (or 7956 counting only the distinct ones).

The product of its digits is 1361367, while the sum is 54.

The square root of 99771777 is about 9988.5823318427. The cubic root of 99771777 is about 463.8055086212.

The spelling of 99771777 in words is "ninety-nine million, seven hundred seventy-one thousand, seven hundred seventy-seven".