85145140 has 24 divisors (see below), whose sum is σ = 183638952. Its totient is φ = 33137280.

The previous prime is 85145119. The next prime is 85145147. The reversal of 85145140 is 4154158.

It can be written as a sum of positive squares in 4 ways, for example, as 9872164 + 75272976 = 3142^2 + 8676^2 .

It is a junction number, because it is equal to n+sod(n) for n = 85145099 and 85145108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85145147) 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, 56791 + ... + 58270.

It is an arithmetic number, because the mean of its divisors is an integer number (7651623).

Almost surely, 2^85145140 is an apocalyptic number.

It is an amenable number.

85145140 is an abundant number, since it is smaller than the sum of its proper divisors (98493812).

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

85145140 is a wasteful number, since it uses less digits than its factorization.

85145140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115107 (or 115105 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 85145140 is about 9227.4124216922. The cubic root of 85145140 is about 439.9330821097.

Adding to 85145140 its reverse (4154158), we get a palindrome (89299298).

The spelling of 85145140 in words is "eighty-five million, one hundred forty-five thousand, one hundred forty".