81339746 has 8 divisors (see below), whose sum is σ = 124847184. Its totient is φ = 39724020.

The previous prime is 81339733. The next prime is 81339761. The reversal of 81339746 is 64793318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 472820 + ... + 472991.

It is an arithmetic number, because the mean of its divisors is an integer number (15605898).

Almost surely, 2^81339746 is an apocalyptic number.

81339746 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

81339746 is a deficient number, since it is larger than the sum of its proper divisors (43507438).

81339746 is a wasteful number, since it uses less digits than its factorization.

81339746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945856.

The product of its digits is 108864, while the sum is 41.

The square root of 81339746 is about 9018.8550271085. The cubic root of 81339746 is about 433.2789637243.

The spelling of 81339746 in words is "eighty-one million, three hundred thirty-nine thousand, seven hundred forty-six".