81077876 has 24 divisors (see below), whose sum is σ = 158388384. Its totient is φ = 35995680.

The previous prime is 81077849. The next prime is 81077897. The reversal of 81077876 is 67877018.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 19535 + ... + 23318.

It is an arithmetic number, because the mean of its divisors is an integer number (6599516).

Almost surely, 2^81077876 is an apocalyptic number.

81077876 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

It is an amenable number.

81077876 is a deficient number, since it is larger than the sum of its proper divisors (77310508).

81077876 is a wasteful number, since it uses less digits than its factorization.

81077876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42911 (or 42909 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 44.

The square root of 81077876 is about 9004.3254050484. The cubic root of 81077876 is about 432.8134891809.

The spelling of 81077876 in words is "eighty-one million, seventy-seven thousand, eight hundred seventy-six".