81336502 has 16 divisors (see below), whose sum is σ = 131549040. Its totient is φ = 37494432.

The previous prime is 81336443. The next prime is 81336509. The reversal of 81336502 is 20563318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81336509) 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 7 ways as a sum of consecutive naturals, for example, 30249 + ... + 32827.

It is an arithmetic number, because the mean of its divisors is an integer number (8221815).

Almost surely, 2^81336502 is an apocalyptic number.

81336502 is a deficient number, since it is larger than the sum of its proper divisors (50212538).

81336502 is a wasteful number, since it uses less digits than its factorization.

81336502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3807.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 81336502 is about 9018.6751798698. The cubic root of 81336502 is about 433.2732036225.

The spelling of 81336502 in words is "eighty-one million, three hundred thirty-six thousand, five hundred two".