85811582 has 4 divisors (see below), whose sum is σ = 128717376. Its totient is φ = 42905790.

The previous prime is 85811569. The next prime is 85811587. The reversal of 85811582 is 28511858.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85811587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21452894 + ... + 21452897.

It is an arithmetic number, because the mean of its divisors is an integer number (32179344).

Almost surely, 2^85811582 is an apocalyptic number.

85811582 is a deficient number, since it is larger than the sum of its proper divisors (42905794).

85811582 is a wasteful number, since it uses less digits than its factorization.

85811582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42905793.

The product of its digits is 25600, while the sum is 38.

The square root of 85811582 is about 9263.4541074051. The cubic root of 85811582 is about 441.0779047311.

The spelling of 85811582 in words is "eighty-five million, eight hundred eleven thousand, five hundred eighty-two".