81473020 has 24 divisors (see below), whose sum is σ = 171987984. Its totient is φ = 32418816.

The previous prime is 81473011. The next prime is 81473047. The reversal of 81473020 is 2037418.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6694 + ... + 14413.

It is an arithmetic number, because the mean of its divisors is an integer number (7166166).

Almost surely, 2^81473020 is an apocalyptic number.

It is an amenable number.

81473020 is an abundant number, since it is smaller than the sum of its proper divisors (90514964).

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

81473020 is a wasteful number, since it uses less digits than its factorization.

81473020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21309 (or 21307 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 81473020 is about 9026.2406349487. The cubic root of 81473020 is about 433.5154750410.

The spelling of 81473020 in words is "eighty-one million, four hundred seventy-three thousand, twenty".