99779667 has 16 divisors (see below), whose sum is σ = 143663520. Its totient is φ = 61235712.

The previous prime is 99779663. The next prime is 99779671. The reversal of 99779667 is 76697799.

It is an interprime number because it is at equal distance from previous prime (99779663) and next prime (99779671).

It is not a de Polignac number, because 99779667 - 2² = 99779663 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99779667.

It is not an unprimeable number, because it can be changed into a prime (99779663) 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 15 ways as a sum of consecutive naturals, for example, 11883 + ... + 18459.

It is an arithmetic number, because the mean of its divisors is an integer number (8978970).

Almost surely, 2^99779667 is an apocalyptic number.

99779667 is a deficient number, since it is larger than the sum of its proper divisors (43883853).

99779667 is a wasteful number, since it uses less digits than its factorization.

99779667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6982.

The product of its digits is 9001692, while the sum is 60.

The square root of 99779667 is about 9988.9772749767. The cubic root of 99779667 is about 463.8177342863.

The spelling of 99779667 in words is "ninety-nine million, seven hundred seventy-nine thousand, six hundred sixty-seven".