85771040 has 24 divisors (see below), whose sum is σ = 202634460. Its totient is φ = 34308352.

The previous prime is 85771039. The next prime is 85771043. The reversal of 85771040 is 4017758.

It can be written as a sum of positive squares in 2 ways, for example, as 83685904 + 2085136 = 9148^2 + 1444^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 85770988 and 85771006.

It is not an unprimeable number, because it can be changed into a prime (85771043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267875 + ... + 268194.

Almost surely, 2^85771040 is an apocalyptic number.

85771040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

85771040 is an abundant number, since it is smaller than the sum of its proper divisors (116863420).

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

85771040 is a wasteful number, since it uses less digits than its factorization.

85771040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536084 (or 536076 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 85771040 is about 9261.2655722639. The cubic root of 85771040 is about 441.0084308252.

Adding to 85771040 its reverse (4017758), we get a palindrome (89788798).

The spelling of 85771040 in words is "eighty-five million, seven hundred seventy-one thousand, forty".