81296776 has 32 divisors (see below), whose sum is σ = 166651200. Its totient is φ = 36872640.

The previous prime is 81296741. The next prime is 81296777. The reversal of 81296776 is 67769218.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81296777) by changing a digit.

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, 61741 + ... + 63043.

It is an arithmetic number, because the mean of its divisors is an integer number (5207850).

Almost surely, 2^81296776 is an apocalyptic number.

It is an amenable number.

81296776 is an abundant number, since it is smaller than the sum of its proper divisors (85354424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81296776 is a wasteful number, since it uses less digits than its factorization.

81296776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2029 (or 2025 counting only the distinct ones).

The product of its digits is 254016, while the sum is 46.

The square root of 81296776 is about 9016.4724809650. The cubic root of 81296776 is about 433.2026530339.

The spelling of 81296776 in words is "eighty-one million, two hundred ninety-six thousand, seven hundred seventy-six".