81425160 has 96 divisors (see below), whose sum is σ = 271828440. Its totient is φ = 21123072.

The previous prime is 81425159. The next prime is 81425177. The reversal of 81425160 is 6152418.

81425160 is a `hidden beast` number, since 8 + 142 + 516 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 77898276 + 3526884 = 8826^2 + 1878^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10264 + ... + 16376.

Almost surely, 2^81425160 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 81425160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135914220).

81425160 is an abundant number, since it is smaller than the sum of its proper divisors (190403280).

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

81425160 is a wasteful number, since it uses less digits than its factorization.

81425160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6167 (or 6160 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 81425160 is about 9023.5890863891. The cubic root of 81425160 is about 433.4305712096.

Adding to 81425160 its reverse (6152418), we get a palindrome (87577578).

The spelling of 81425160 in words is "eighty-one million, four hundred twenty-five thousand, one hundred sixty".