85771997400 has 96 divisors (see below), whose sum is σ = 266853612240. Its totient is φ = 22789916160.

The previous prime is 85771997383. The next prime is 85771997401. The reversal of 85771997400 is 479917758.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85771997401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91839 + ... + 424238.

Almost surely, 2^85771997400 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 85771997400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133426806120).

85771997400 is an abundant number, since it is smaller than the sum of its proper divisors (181081614840).

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

85771997400 is a wasteful number, since it uses less digits than its factorization.

85771997400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516373 (or 516364 counting only the distinct ones).

The product of its (nonzero) digits is 4445280, while the sum is 57.

The spelling of 85771997400 in words is "eighty-five billion, seven hundred seventy-one million, nine hundred ninety-seven thousand, four hundred".