81506674 has 8 divisors (see below), whose sum is σ = 123342300. Its totient is φ = 40392576.

The previous prime is 81506627. The next prime is 81506693. The reversal of 81506674 is 47660518.

It can be written as a sum of positive squares in 2 ways, for example, as 75951225 + 5555449 = 8715^2 + 2357^2 .

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, 180099 + ... + 180550.

Almost surely, 2^81506674 is an apocalyptic number.

81506674 is a deficient number, since it is larger than the sum of its proper divisors (41835626).

81506674 is a wasteful number, since it uses less digits than its factorization.

81506674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360764.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 81506674 is about 9028.1046737397. The cubic root of 81506674 is about 433.5751574628.

The spelling of 81506674 in words is "eighty-one million, five hundred six thousand, six hundred seventy-four".