81610260 has 24 divisors (see below), whose sum is σ = 228508896. Its totient is φ = 21762720.

The previous prime is 81610247. The next prime is 81610261. The reversal of 81610260 is 6201618.

It is a self number, because there is not a number n which added to its sum of digits gives 81610260.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81610261) 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, 680026 + ... + 680145.

It is an arithmetic number, because the mean of its divisors is an integer number (9521204).

Almost surely, 2^81610260 is an apocalyptic number.

It is an amenable number.

81610260 is an abundant number, since it is smaller than the sum of its proper divisors (146898636).

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

81610260 is a wasteful number, since it uses less digits than its factorization.

81610260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360183 (or 1360181 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 81610260 is about 9033.8397152042. The cubic root of 81610260 is about 433.7587551212.

Adding to 81610260 its reverse (6201618), we get a palindrome (87811878).

The spelling of 81610260 in words is "eighty-one million, six hundred ten thousand, two hundred sixty".