99779775 has 12 divisors (see below), whose sum is σ = 164969352. Its totient is φ = 53215840.

The previous prime is 99779767. The next prime is 99779777. The reversal of 99779775 is 57797799.

It is a happy number.

It is not a de Polignac number, because 99779775 - 2³ = 99779767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99779777) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 665124 + ... + 665273.

It is an arithmetic number, because the mean of its divisors is an integer number (13747446).

Almost surely, 2^99779775 is an apocalyptic number.

99779775 is a deficient number, since it is larger than the sum of its proper divisors (65189577).

99779775 is a wasteful number, since it uses less digits than its factorization.

99779775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330410 (or 1330405 counting only the distinct ones).

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

The square root of 99779775 is about 9988.9826809340. The cubic root of 99779775 is about 463.8179016293.

The spelling of 99779775 in words is "ninety-nine million, seven hundred seventy-nine thousand, seven hundred seventy-five".