85811642 has 12 divisors (see below), whose sum is σ = 149732730. Its totient is φ = 36776376.

The previous prime is 85811641. The next prime is 85811651. The reversal of 85811642 is 24611858.

It can be written as a sum of positive squares in only one way, i.e., 76195441 + 9616201 = 8729^2 + 3101^2 .

It is not an unprimeable number, because it can be changed into a prime (85811641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 437717 + ... + 437912.

Almost surely, 2^85811642 is an apocalyptic number.

85811642 is a deficient number, since it is larger than the sum of its proper divisors (63921088).

85811642 is a wasteful number, since it uses less digits than its factorization.

85811642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875645 (or 875638 counting only the distinct ones).

The product of its digits is 15360, while the sum is 35.

The square root of 85811642 is about 9263.4573459373. The cubic root of 85811642 is about 441.0780075326.

The spelling of 85811642 in words is "eighty-five million, eight hundred eleven thousand, six hundred forty-two".