81760156 has 6 divisors (see below), whose sum is σ = 143080280. Its totient is φ = 40880076.

The previous prime is 81760139. The next prime is 81760163. The reversal of 81760156 is 65106718.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 10220016 + ... + 10220023.

Almost surely, 2^81760156 is an apocalyptic number.

It is an amenable number.

81760156 is a deficient number, since it is larger than the sum of its proper divisors (61320124).

81760156 is a wasteful number, since it uses less digits than its factorization.

81760156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20440043 (or 20440041 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 81760156 is about 9042.1322706539. The cubic root of 81760156 is about 434.0241585793.

The spelling of 81760156 in words is "eighty-one million, seven hundred sixty thousand, one hundred fifty-six".