85977691 has 8 divisors (see below), whose sum is σ = 87729840. Its totient is φ = 84235488.

The previous prime is 85977673. The next prime is 85977701. The reversal of 85977691 is 19677958.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85977691 - 2⁵ = 85977659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85977631) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 16405 + ... + 21001.

It is an arithmetic number, because the mean of its divisors is an integer number (10966230).

Almost surely, 2^85977691 is an apocalyptic number.

85977691 is a deficient number, since it is larger than the sum of its proper divisors (1752149).

85977691 is a wasteful number, since it uses less digits than its factorization.

85977691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4973.

The product of its digits is 952560, while the sum is 52.

The square root of 85977691 is about 9272.4155968119. The cubic root of 85977691 is about 441.3623254873.

It can be divided in two parts, 85977 and 691, that added together give a palindrome (86668).

The spelling of 85977691 in words is "eighty-five million, nine hundred seventy-seven thousand, six hundred ninety-one".