81732874 has 8 divisors (see below), whose sum is σ = 122666148. Its totient is φ = 40844160.

The previous prime is 81732853. The next prime is 81732881. The reversal of 81732874 is 47823718.

It can be written as a sum of positive squares in 2 ways, for example, as 79977249 + 1755625 = 8943^2 + 1325^2 .

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

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 in 3 ways as a sum of consecutive naturals, for example, 6097 + ... + 14164.

Almost surely, 2^81732874 is an apocalyptic number.

81732874 is a deficient number, since it is larger than the sum of its proper divisors (40933274).

81732874 is a wasteful number, since it uses less digits than its factorization.

81732874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22280.

The product of its digits is 75264, while the sum is 40.

The square root of 81732874 is about 9040.6235404423. The cubic root of 81732874 is about 433.9758776685.

The spelling of 81732874 in words is "eighty-one million, seven hundred thirty-two thousand, eight hundred seventy-four".