85779999 has 32 divisors (see below), whose sum is σ = 133401600. Its totient is φ = 54401760.

The previous prime is 85779989. The next prime is 85780001. The reversal of 85779999 is 99997758.

It is not a de Polignac number, because 85779999 - 2⁴ = 85779983 is a prime.

85779999 is a modest number, since divided by 9999 gives 8577 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85779959) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54822 + ... + 56364.

It is an arithmetic number, because the mean of its divisors is an integer number (4168800).

Almost surely, 2^85779999 is an apocalyptic number.

85779999 is a deficient number, since it is larger than the sum of its proper divisors (47621601).

85779999 is a wasteful number, since it uses less digits than its factorization.

85779999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652 (or 1646 counting only the distinct ones).

The product of its digits is 12859560, while the sum is 63.

The square root of 85779999 is about 9261.7492408292. The cubic root of 85779999 is about 441.0237851024.

The spelling of 85779999 in words is "eighty-five million, seven hundred seventy-nine thousand, nine hundred ninety-nine".