81303706 has 16 divisors (see below), whose sum is σ = 133895520. Its totient is φ = 36719280.

The previous prime is 81303683. The next prime is 81303713. The reversal of 81303706 is 60730318.

It is a super-2 number, since 2×81303706² = 13220585218668872, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8316 + ... + 15223.

It is an arithmetic number, because the mean of its divisors is an integer number (8368470).

Almost surely, 2^81303706 is an apocalyptic number.

81303706 is a deficient number, since it is larger than the sum of its proper divisors (52591814).

81303706 is a wasteful number, since it uses less digits than its factorization.

81303706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23709.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 81303706 is about 9016.8567694070. The cubic root of 81303706 is about 433.2149618824.

The spelling of 81303706 in words is "eighty-one million, three hundred three thousand, seven hundred six".