81675074 has 16 divisors (see below), whose sum is σ = 132329400. Its totient is φ = 37584000.

The previous prime is 81675073. The next prime is 81675079. The reversal of 81675074 is 47057618.

It can be written as a sum of positive squares in 4 ways, for example, as 52461049 + 29214025 = 7243^2 + 5405^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81675073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4574 + ... + 13574.

Almost surely, 2^81675074 is an apocalyptic number.

81675074 is a deficient number, since it is larger than the sum of its proper divisors (50654326).

81675074 is a wasteful number, since it uses less digits than its factorization.

81675074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9365.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 81675074 is about 9037.4262929221. The cubic root of 81675074 is about 433.8735535984.

The spelling of 81675074 in words is "eighty-one million, six hundred seventy-five thousand, seventy-four".