85040087780 has 96 divisors (see below), whose sum is σ = 192245961600. Its totient is φ = 31535013888.

The previous prime is 85040087761. The next prime is 85040087789. The reversal of 85040087780 is 8778004058.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (85040087789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1442564 + ... + 1500356.

It is an arithmetic number, because the mean of its divisors is an integer number (2002562100).

Almost surely, 2^85040087780 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 85040087780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96122980800).

85040087780 is an abundant number, since it is smaller than the sum of its proper divisors (107205873820).

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

85040087780 is a wasteful number, since it uses less digits than its factorization.

85040087780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57933 (or 57931 counting only the distinct ones).

The product of its (nonzero) digits is 501760, while the sum is 47.

The spelling of 85040087780 in words is "eighty-five billion, forty million, eighty-seven thousand, seven hundred eighty".