81305074 has 8 divisors (see below), whose sum is σ = 124258860. Its totient is φ = 39885456.

The previous prime is 81305017. The next prime is 81305087. The reversal of 81305074 is 47050318.

It can be written as a sum of positive squares in 2 ways, for example, as 67354849 + 13950225 = 8207^2 + 3735^2 .

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

It is a super-2 number, since 2×81305074² = 13221030116290952, which contains 22 as substring.

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, 383409 + ... + 383620.

Almost surely, 2^81305074 is an apocalyptic number.

81305074 is a deficient number, since it is larger than the sum of its proper divisors (42953786).

81305074 is a wasteful number, since it uses less digits than its factorization.

81305074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767084.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 81305074 is about 9016.9326270079. The cubic root of 81305074 is about 433.2173915983.

The spelling of 81305074 in words is "eighty-one million, three hundred five thousand, seventy-four".