85138919790 has 16 divisors (see below), whose sum is σ = 204333407568. Its totient is φ = 22703711936.

The previous prime is 85138919689. The next prime is 85138919791. The reversal of 85138919790 is 9791983158.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85138919791) 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, 1418981967 + ... + 1418982026.

It is an arithmetic number, because the mean of its divisors is an integer number (12770837973).

Almost surely, 2^85138919790 is an apocalyptic number.

85138919790 is an abundant number, since it is smaller than the sum of its proper divisors (119194487778).

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

85138919790 is a wasteful number, since it uses less digits than its factorization.

85138919790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2837964003.

The product of its (nonzero) digits is 4898880, while the sum is 60.

The spelling of 85138919790 in words is "eighty-five billion, one hundred thirty-eight million, nine hundred nineteen thousand, seven hundred ninety".