81608130 has 24 divisors (see below), whose sum is σ = 212181372. Its totient is φ = 21762144.

The previous prime is 81608123. The next prime is 81608159. The reversal of 81608130 is 3180618.

It can be written as a sum of positive squares in 2 ways, for example, as 68409441 + 13198689 = 8271^2 + 3633^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81608094 and 81608103.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 453289 + ... + 453468.

Almost surely, 2^81608130 is an apocalyptic number.

81608130 is an abundant number, since it is smaller than the sum of its proper divisors (130573242).

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

81608130 is a wasteful number, since it uses less digits than its factorization.

81608130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906770 (or 906767 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 81608130 is about 9033.7218243645. The cubic root of 81608130 is about 433.7549814364.

Adding to 81608130 its reverse (3180618), we get a palindrome (84788748).

It can be divided in two parts, 8160 and 8130, that added together give a triangular number (16290 = T₁₈₀).

The spelling of 81608130 in words is "eighty-one million, six hundred eight thousand, one hundred thirty".