85891778 has 16 divisors (see below), whose sum is σ = 147752640. Its totient is φ = 36683376.

The previous prime is 85891759. The next prime is 85891781. The reversal of 85891778 is 87719858.

It is a happy number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6368 + ... + 14571.

It is an arithmetic number, because the mean of its divisors is an integer number (9234540).

Almost surely, 2^85891778 is an apocalyptic number.

85891778 is a deficient number, since it is larger than the sum of its proper divisors (61860862).

85891778 is a wasteful number, since it uses less digits than its factorization.

85891778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21241.

The product of its digits is 1128960, while the sum is 53.

The square root of 85891778 is about 9267.7817194839. The cubic root of 85891778 is about 441.2152664145.

The spelling of 85891778 in words is "eighty-five million, eight hundred ninety-one thousand, seven hundred seventy-eight".