81768914 has 8 divisors (see below), whose sum is σ = 124664268. Its totient is φ = 40214160.

The previous prime is 81768847. The next prime is 81768923. The reversal of 81768914 is 41986718.

It can be written as a sum of positive squares in 2 ways, for example, as 78765625 + 3003289 = 8875^2 + 1733^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 334997 + ... + 335240.

Almost surely, 2^81768914 is an apocalyptic number.

81768914 is a deficient number, since it is larger than the sum of its proper divisors (42895354).

81768914 is a wasteful number, since it uses less digits than its factorization.

81768914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670300.

The product of its digits is 96768, while the sum is 44.

The square root of 81768914 is about 9042.6165461110. The cubic root of 81768914 is about 434.0396553202.

The spelling of 81768914 in words is "eighty-one million, seven hundred sixty-eight thousand, nine hundred fourteen".