81068474 has 4 divisors (see below), whose sum is σ = 121602714. Its totient is φ = 40534236.

The previous prime is 81068473. The next prime is 81068483. The reversal of 81068474 is 47486018.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 41692849 + 39375625 = 6457^2 + 6275^2 .

It is not an unprimeable number, because it can be changed into a prime (81068473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20267117 + ... + 20267120.

Almost surely, 2^81068474 is an apocalyptic number.

81068474 is a deficient number, since it is larger than the sum of its proper divisors (40534240).

81068474 is a wasteful number, since it uses less digits than its factorization.

81068474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40534239.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 81068474 is about 9003.8033074918. The cubic root of 81068474 is about 432.7967584773.

The spelling of 81068474 in words is "eighty-one million, sixty-eight thousand, four hundred seventy-four".