85891779 has 16 divisors (see below), whose sum is σ = 127543840. Its totient is φ = 57127680.

The previous prime is 85891759. The next prime is 85891781. The reversal of 85891779 is 97719858.

It is not a de Polignac number, because 85891779 - 2⁸ = 85891523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85891759) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8859 + ... + 15819.

It is an arithmetic number, because the mean of its divisors is an integer number (7971490).

Almost surely, 2^85891779 is an apocalyptic number.

85891779 is a deficient number, since it is larger than the sum of its proper divisors (41652061).

85891779 is a wasteful number, since it uses less digits than its factorization.

85891779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7427 (or 7421 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 54.

The square root of 85891779 is about 9267.7817734342. The cubic root of 85891779 is about 441.2152681268.

The spelling of 85891779 in words is "eighty-five million, eight hundred ninety-one thousand, seven hundred seventy-nine".