85807778 has 16 divisors (see below), whose sum is σ = 147551424. Its totient is φ = 36661680.

The previous prime is 85807769. The next prime is 85807817. The reversal of 85807778 is 87770858.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4625 + ... + 13892.

It is an arithmetic number, because the mean of its divisors is an integer number (9221964).

Almost surely, 2^85807778 is an apocalyptic number.

85807778 is a deficient number, since it is larger than the sum of its proper divisors (61743646).

85807778 is a wasteful number, since it uses less digits than its factorization.

85807778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18857.

The product of its (nonzero) digits is 878080, while the sum is 50.

The square root of 85807778 is about 9263.2487821498. The cubic root of 85807778 is about 441.0713870206.

The spelling of 85807778 in words is "eighty-five million, eight hundred seven thousand, seven hundred seventy-eight".