81404876 has 24 divisors (see below), whose sum is σ = 166135200. Its totient is φ = 34887216.

The previous prime is 81404833. The next prime is 81404881. The reversal of 81404876 is 67840418.

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, 28295 + ... + 31038.

It is an arithmetic number, because the mean of its divisors is an integer number (6922300).

Almost surely, 2^81404876 is an apocalyptic number.

It is an amenable number.

81404876 is an abundant number, since it is smaller than the sum of its proper divisors (84730324).

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

81404876 is a wasteful number, since it uses less digits than its factorization.

81404876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59358 (or 59342 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 81404876 is about 9022.4650733599. The cubic root of 81404876 is about 433.3945772742.

The spelling of 81404876 in words is "eighty-one million, four hundred four thousand, eight hundred seventy-six".