81077976 has 64 divisors (see below), whose sum is σ = 257395200. Its totient is φ = 23164704.

The previous prime is 81077957. The next prime is 81078001. The reversal of 81077976 is 67977018.

It is a happy number.

It is a nialpdrome in base 14.

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 15 ways as a sum of consecutive naturals, for example, 25300 + ... + 28323.

It is an arithmetic number, because the mean of its divisors is an integer number (4021800).

Almost surely, 2^81077976 is an apocalyptic number.

It is an amenable number.

81077976 is an abundant number, since it is smaller than the sum of its proper divisors (176317224).

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

81077976 is a wasteful number, since it uses less digits than its factorization.

81077976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53645 (or 53635 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 45.

The square root of 81077976 is about 9004.3309579335. The cubic root of 81077976 is about 432.8136671223.

The spelling of 81077976 in words is "eighty-one million, seventy-seven thousand, nine hundred seventy-six".