81961060 has 24 divisors (see below), whose sum is σ = 181177920. Its totient is φ = 31058784.

The previous prime is 81961043. The next prime is 81961081. The reversal of 81961060 is 6016918.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107464 + ... + 108223.

It is an arithmetic number, because the mean of its divisors is an integer number (7549080).

Almost surely, 2^81961060 is an apocalyptic number.

It is an amenable number.

81961060 is an abundant number, since it is smaller than the sum of its proper divisors (99216860).

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

81961060 is a wasteful number, since it uses less digits than its factorization.

81961060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215715 (or 215713 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 81961060 is about 9053.2347810051. The cubic root of 81961060 is about 434.3793677252.

Adding to 81961060 its reverse (6016918), we get a palindrome (87977978).

The spelling of 81961060 in words is "eighty-one million, nine hundred sixty-one thousand, sixty".