85997423736 has 320 divisors, whose sum is σ = 282340800000. Its totient is φ = 24248113344.

The previous prime is 85997423719. The next prime is 85997423749. The reversal of 85997423736 is 63732479958.

85997423736 is a `hidden beast` number, since 8 + 59 + 97 + 423 + 73 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 40969615 + ... + 40971713.

It is an arithmetic number, because the mean of its divisors is an integer number (882315000).

Almost surely, 2^85997423736 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 85997423736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141170400000).

85997423736 is an abundant number, since it is smaller than the sum of its proper divisors (196343376264).

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

85997423736 is a wasteful number, since it uses less digits than its factorization.

85997423736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2221 (or 2190 counting only the distinct ones).

The product of its digits is 68584320, while the sum is 63.

The spelling of 85997423736 in words is "eighty-five billion, nine hundred ninety-seven million, four hundred twenty-three thousand, seven hundred thirty-six".