81339754 has 8 divisors (see below), whose sum is σ = 122160708. Its totient is φ = 40619520.

The previous prime is 81339733. The next prime is 81339761. The reversal of 81339754 is 45793318.

It can be written as a sum of positive squares in 2 ways, for example, as 79834225 + 1505529 = 8935^2 + 1227^2 .

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, 23127 + ... + 26410.

Almost surely, 2^81339754 is an apocalyptic number.

81339754 is a deficient number, since it is larger than the sum of its proper divisors (40820954).

81339754 is a wasteful number, since it uses less digits than its factorization.

81339754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50360.

The product of its digits is 90720, while the sum is 40.

The square root of 81339754 is about 9018.8554706238. The cubic root of 81339754 is about 433.2789779291.

The spelling of 81339754 in words is "eighty-one million, three hundred thirty-nine thousand, seven hundred fifty-four".