99777975 has 24 divisors (see below), whose sum is σ = 179964672. Its totient is φ = 48376800.

The previous prime is 99777971. The next prime is 99778013. The reversal of 99777975 is 57977799.

It is a happy number.

It is not a de Polignac number, because 99777975 - 2² = 99777971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99777971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59647 + ... + 61296.

It is an arithmetic number, because the mean of its divisors is an integer number (7498528).

Almost surely, 2^99777975 is an apocalyptic number.

99777975 is a deficient number, since it is larger than the sum of its proper divisors (80186697).

99777975 is a wasteful number, since it uses less digits than its factorization.

99777975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120967 (or 120962 counting only the distinct ones).

The product of its digits is 8751645, while the sum is 60.

The square root of 99777975 is about 9988.8925812624. The cubic root of 99777975 is about 463.8151125630.

The spelling of 99777975 in words is "ninety-nine million, seven hundred seventy-seven thousand, nine hundred seventy-five".