85582778 has 4 divisors (see below), whose sum is σ = 128374170. Its totient is φ = 42791388.

The previous prime is 85582759. The next prime is 85582781. The reversal of 85582778 is 87728558.

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., 53919649 + 31663129 = 7343^2 + 5627^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21395693 + ... + 21395696.

Almost surely, 2^85582778 is an apocalyptic number.

85582778 is a deficient number, since it is larger than the sum of its proper divisors (42791392).

85582778 is a wasteful number, since it uses less digits than its factorization.

85582778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42791391.

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

The square root of 85582778 is about 9251.0960431724. The cubic root of 85582778 is about 440.6855326055.

The spelling of 85582778 in words is "eighty-five million, five hundred eighty-two thousand, seven hundred seventy-eight".