81610344 has 24 divisors (see below), whose sum is σ = 221028210. Its totient is φ = 27203424.

The previous prime is 81610343. The next prime is 81610349. The reversal of 81610344 is 44301618.

81610344 is a `hidden beast` number, since 8 + 1 + 610 + 3 + 44 = 666.

It can be written as a sum of positive squares in only one way, i.e., 75168900 + 6441444 = 8670^2 + 2538^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (81610343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 566667 + ... + 566810.

Almost surely, 2^81610344 is an apocalyptic number.

It is an amenable number.

81610344 is an abundant number, since it is smaller than the sum of its proper divisors (139417866).

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

81610344 is a wasteful number, since it uses less digits than its factorization.

81610344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133489 (or 1133482 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 81610344 is about 9033.8443643888. The cubic root of 81610344 is about 433.7589039412.

The spelling of 81610344 in words is "eighty-one million, six hundred ten thousand, three hundred forty-four".