81494636 has 12 divisors (see below), whose sum is σ = 143355912. Its totient is φ = 40535808.

The previous prime is 81494603. The next prime is 81494653. The reversal of 81494636 is 63649418.

It is a junction number, because it is equal to n+sod(n) for n = 81494593 and 81494602.

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 3 ways as a sum of consecutive naturals, for example, 52010 + ... + 53553.

It is an arithmetic number, because the mean of its divisors is an integer number (11946326).

Almost surely, 2^81494636 is an apocalyptic number.

It is an amenable number.

81494636 is a deficient number, since it is larger than the sum of its proper divisors (61861276).

81494636 is a wasteful number, since it uses less digits than its factorization.

81494636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105760 (or 105758 counting only the distinct ones).

The product of its digits is 124416, while the sum is 41.

The square root of 81494636 is about 9027.4379532623. The cubic root of 81494636 is about 433.5538110115.

The spelling of 81494636 in words is "eighty-one million, four hundred ninety-four thousand, six hundred thirty-six".