85195778 has 4 divisors (see below), whose sum is σ = 127793670. Its totient is φ = 42597888.

The previous prime is 85195777. The next prime is 85195807. The reversal of 85195778 is 87759158.

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

It can be written as a sum of positive squares in only one way, i.e., 70778569 + 14417209 = 8413^2 + 3797^2 .

It is not an unprimeable number, because it can be changed into a prime (85195777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21298943 + ... + 21298946.

Almost surely, 2^85195778 is an apocalyptic number.

85195778 is a deficient number, since it is larger than the sum of its proper divisors (42597892).

85195778 is a wasteful number, since it uses less digits than its factorization.

85195778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42597891.

The product of its digits is 705600, while the sum is 50.

The square root of 85195778 is about 9230.1559033420. The cubic root of 85195778 is about 440.0202779911.

The spelling of 85195778 in words is "eighty-five million, one hundred ninety-five thousand, seven hundred seventy-eight".