81617346 has 12 divisors (see below), whose sum is σ = 176837622. Its totient is φ = 27205776.

The previous prime is 81617321. The next prime is 81617381. The reversal of 81617346 is 64371618.

81617346 is a `hidden beast` number, since 8 + 1 + 617 + 34 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 71216721 + 10400625 = 8439^2 + 3225^2 .

It is a super-2 number, since 2×81617346² = 13322782336167432, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81617346.

It is an unprimeable number.

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, 2267131 + ... + 2267166.

Almost surely, 2^81617346 is an apocalyptic number.

81617346 is an abundant number, since it is smaller than the sum of its proper divisors (95220276).

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

81617346 is a wasteful number, since it uses less digits than its factorization.

81617346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4534305 (or 4534302 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 81617346 is about 9034.2318987283. The cubic root of 81617346 is about 433.7713087943.

The spelling of 81617346 in words is "eighty-one million, six hundred seventeen thousand, three hundred forty-six".