81473786 has 8 divisors (see below), whose sum is σ = 128642880. Its totient is φ = 38592828.

The previous prime is 81473783. The next prime is 81473801. The reversal of 81473786 is 68737418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (81473783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1071986 + ... + 1072061.

It is an arithmetic number, because the mean of its divisors is an integer number (16080360).

Almost surely, 2^81473786 is an apocalyptic number.

81473786 is a deficient number, since it is larger than the sum of its proper divisors (47169094).

81473786 is a wasteful number, since it uses less digits than its factorization.

81473786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144068.

The product of its digits is 225792, while the sum is 44.

The square root of 81473786 is about 9026.2830666892. The cubic root of 81473786 is about 433.5168336577.

The spelling of 81473786 in words is "eighty-one million, four hundred seventy-three thousand, seven hundred eighty-six".