85785278 has 4 divisors (see below), whose sum is σ = 128677920. Its totient is φ = 42892638.

The previous prime is 85785269. The next prime is 85785283. The reversal of 85785278 is 87258758.

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

It is a super-2 number, since 2×85785278² = 14718227843074568, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21446318 + ... + 21446321.

It is an arithmetic number, because the mean of its divisors is an integer number (32169480).

Almost surely, 2^85785278 is an apocalyptic number.

85785278 is a deficient number, since it is larger than the sum of its proper divisors (42892642).

85785278 is a wasteful number, since it uses less digits than its factorization.

85785278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42892641.

The product of its digits is 1254400, while the sum is 50.

The square root of 85785278 is about 9262.0342258059. The cubic root of 85785278 is about 441.0328319542.

The spelling of 85785278 in words is "eighty-five million, seven hundred eighty-five thousand, two hundred seventy-eight".