81601260 has 96 divisors (see below), whose sum is σ = 247665600. Its totient is φ = 19955712.

The previous prime is 81601253. The next prime is 81601277. The reversal of 81601260 is 6210618.

It is a self number, because there is not a number n which added to its sum of digits gives 81601260.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 181516 + ... + 181964.

It is an arithmetic number, because the mean of its divisors is an integer number (2579850).

Almost surely, 2^81601260 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 81601260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123832800).

81601260 is an abundant number, since it is smaller than the sum of its proper divisors (166064340).

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

81601260 is a wasteful number, since it uses less digits than its factorization.

81601260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707 (or 705 counting only the distinct ones).

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

The square root of 81601260 is about 9033.3415744120. The cubic root of 81601260 is about 433.7428095268.

Adding to 81601260 its reverse (6210618), we get a palindrome (87811878).

The spelling of 81601260 in words is "eighty-one million, six hundred one thousand, two hundred sixty".