85636397880 has 384 divisors, whose sum is σ = 323389946880. Its totient is φ = 20198315520.

The previous prime is 85636397837. The next prime is 85636397909. The reversal of 85636397880 is 8879363658.

85636397880 is a `hidden beast` number, since 8 + 563 + 63 + 9 + 7 + 8 + 8 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3945217 + ... + 3966863.

It is an arithmetic number, because the mean of its divisors is an integer number (842161320).

Almost surely, 2^85636397880 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 85636397880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161694973440).

85636397880 is an abundant number, since it is smaller than the sum of its proper divisors (237753549000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85636397880 is a wasteful number, since it uses less digits than its factorization.

85636397880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21721 (or 21705 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 63.

The spelling of 85636397880 in words is "eighty-five billion, six hundred thirty-six million, three hundred ninety-seven thousand, eight hundred eighty".