81614224 has 10 divisors (see below), whose sum is σ = 158127590. Its totient is φ = 40807104.

The previous prime is 81614201. The next prime is 81614233. The reversal of 81614224 is 42241618.

It can be written as a sum of positive squares in only one way, i.e., 78004224 + 3610000 = 8832^2 + 1900^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81614192 and 81614201.

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 as a sum of consecutive naturals, namely, 2550429 + ... + 2550460.

It is an arithmetic number, because the mean of its divisors is an integer number (15812759).

Almost surely, 2^81614224 is an apocalyptic number.

It is an amenable number.

81614224 is a deficient number, since it is larger than the sum of its proper divisors (76513366).

81614224 is a wasteful number, since it uses less digits than its factorization.

81614224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5100897 (or 5100891 counting only the distinct ones).

The product of its digits is 3072, while the sum is 28.

The square root of 81614224 is about 9034.0591098354. The cubic root of 81614224 is about 433.7657778978.

The spelling of 81614224 in words is "eighty-one million, six hundred fourteen thousand, two hundred twenty-four".