85677991 has 8 divisors (see below), whose sum is σ = 98035200. Its totient is φ = 73350168.

The previous prime is 85677989. The next prime is 85678001. The reversal of 85677991 is 19977658.

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 85677991 - 2¹ = 85677989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85677491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 691 + ... + 13108.

It is an arithmetic number, because the mean of its divisors is an integer number (12254400).

Almost surely, 2^85677991 is an apocalyptic number.

85677991 is a deficient number, since it is larger than the sum of its proper divisors (12357209).

85677991 is a wasteful number, since it uses less digits than its factorization.

85677991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14693.

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

The square root of 85677991 is about 9256.2406515820. The cubic root of 85677991 is about 440.8488966299.

It can be divided in two parts, 85677 and 991, that added together give a palindrome (86668).

The spelling of 85677991 in words is "eighty-five million, six hundred seventy-seven thousand, nine hundred ninety-one".