81674798 has 4 divisors (see below), whose sum is σ = 122512200. Its totient is φ = 40837398.

The previous prime is 81674773. The next prime is 81674833. The reversal of 81674798 is 89747618.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20418698 + ... + 20418701.

It is an arithmetic number, because the mean of its divisors is an integer number (30628050).

Almost surely, 2^81674798 is an apocalyptic number.

81674798 is a deficient number, since it is larger than the sum of its proper divisors (40837402).

81674798 is a wasteful number, since it uses less digits than its factorization.

81674798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40837401.

The product of its digits is 677376, while the sum is 50.

The square root of 81674798 is about 9037.4110230751. The cubic root of 81674798 is about 433.8730648763.

The spelling of 81674798 in words is "eighty-one million, six hundred seventy-four thousand, seven hundred ninety-eight".