81703774 has 8 divisors (see below), whose sum is σ = 127884240. Its totient is φ = 39075696.

The previous prime is 81703771. The next prime is 81703829. The reversal of 81703774 is 47730718.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81703771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 888039 + ... + 888130.

It is an arithmetic number, because the mean of its divisors is an integer number (15985530).

Almost surely, 2^81703774 is an apocalyptic number.

81703774 is a deficient number, since it is larger than the sum of its proper divisors (46180466).

81703774 is a wasteful number, since it uses less digits than its factorization.

81703774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1776194.

The product of its (nonzero) digits is 32928, while the sum is 37.

The square root of 81703774 is about 9039.0139949001. The cubic root of 81703774 is about 433.9243676029.

The spelling of 81703774 in words is "eighty-one million, seven hundred three thousand, seven hundred seventy-four".