85821988374 has 64 divisors (see below), whose sum is σ = 191983841280. Its totient is φ = 28417314240.

The previous prime is 85821988337. The next prime is 85821988379. The reversal of 85821988374 is 47388912858.

85821988374 is a `hidden beast` number, since 8 + 582 + 19 + 8 + 8 + 37 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85821988379) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23363802 + ... + 23367474.

It is an arithmetic number, because the mean of its divisors is an integer number (2999747520).

Almost surely, 2^85821988374 is an apocalyptic number.

85821988374 is an abundant number, since it is smaller than the sum of its proper divisors (106161852906).

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

85821988374 is a wasteful number, since it uses less digits than its factorization.

85821988374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6442 (or 6436 counting only the distinct ones).

The product of its digits is 30965760, while the sum is 63.

The spelling of 85821988374 in words is "eighty-five billion, eight hundred twenty-one million, nine hundred eighty-eight thousand, three hundred seventy-four".