81776827 has 8 divisors (see below), whose sum is σ = 90894960. Its totient is φ = 72939360.

The previous prime is 81776797. The next prime is 81776869. The reversal of 81776827 is 72867718.

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

It is a cyclic number.

It is not a de Polignac number, because 81776827 - 2¹⁹ = 81252539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81776887) 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 7 ways as a sum of consecutive naturals, for example, 69552 + ... + 70717.

It is an arithmetic number, because the mean of its divisors is an integer number (11361870).

Almost surely, 2^81776827 is an apocalyptic number.

81776827 is a deficient number, since it is larger than the sum of its proper divisors (9118133).

81776827 is a wasteful number, since it uses less digits than its factorization.

81776827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140333.

The product of its digits is 263424, while the sum is 46.

The square root of 81776827 is about 9043.0540748134. The cubic root of 81776827 is about 434.0536559342.

The spelling of 81776827 in words is "eighty-one million, seven hundred seventy-six thousand, eight hundred twenty-seven".