85397135920 has 40 divisors (see below), whose sum is σ = 204953132160. Its totient is φ = 33056954880.

The previous prime is 85397135917. The next prime is 85397135927. The reversal of 85397135920 is 2953179358.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (85397135927) 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, 17214685 + ... + 17219644.

It is an arithmetic number, because the mean of its divisors is an integer number (5123828304).

Almost surely, 2^85397135920 is an apocalyptic number.

85397135920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

85397135920 is an abundant number, since it is smaller than the sum of its proper divisors (119555996240).

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

85397135920 is a wasteful number, since it uses less digits than its factorization.

85397135920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34434373 (or 34434367 counting only the distinct ones).

The product of its (nonzero) digits is 2041200, while the sum is 52.

The spelling of 85397135920 in words is "eighty-five billion, three hundred ninety-seven million, one hundred thirty-five thousand, nine hundred twenty".