81471800 has 24 divisors (see below), whose sum is σ = 189422400. Its totient is φ = 32588640.

The previous prime is 81471763. The next prime is 81471857. The reversal of 81471800 is 817418.

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 5 ways as a sum of consecutive naturals, for example, 203480 + ... + 203879.

It is an arithmetic number, because the mean of its divisors is an integer number (7892600).

Almost surely, 2^81471800 is an apocalyptic number.

It is an amenable number.

81471800 is an abundant number, since it is smaller than the sum of its proper divisors (107950600).

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

81471800 is a wasteful number, since it uses less digits than its factorization.

81471800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407375 (or 407366 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 81471800 is about 9026.1730539581. The cubic root of 81471800 is about 433.5133111691.

The spelling of 81471800 in words is "eighty-one million, four hundred seventy-one thousand, eight hundred".