85779791 has 4 divisors (see below), whose sum is σ = 86059512. Its totient is φ = 85500072.

The previous prime is 85779787. The next prime is 85779823. The reversal of 85779791 is 19797758.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85779791 - 2² = 85779787 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85779731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139400 + ... + 140013.

It is an arithmetic number, because the mean of its divisors is an integer number (21514878).

Almost surely, 2^85779791 is an apocalyptic number.

85779791 is a deficient number, since it is larger than the sum of its proper divisors (279721).

85779791 is a wasteful number, since it uses less digits than its factorization.

85779791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279720.

The product of its digits is 1111320, while the sum is 53.

The square root of 85779791 is about 9261.7380118421. The cubic root of 85779791 is about 441.0234286362.

The spelling of 85779791 in words is "eighty-five million, seven hundred seventy-nine thousand, seven hundred ninety-one".