81473808 has 80 divisors (see below), whose sum is σ = 230610240. Its totient is φ = 24632832.

The previous prime is 81473807. The next prime is 81473827. The reversal of 81473808 is 80837418.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (81473801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35710 + ... + 37922.

It is an arithmetic number, because the mean of its divisors is an integer number (2882628).

Almost surely, 2^81473808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81473808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115305120).

81473808 is an abundant number, since it is smaller than the sum of its proper divisors (149136432).

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

81473808 is a wasteful number, since it uses less digits than its factorization.

81473808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2296 (or 2290 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 81473808 is about 9026.2842853524. The cubic root of 81473808 is about 433.5168726779.

The spelling of 81473808 in words is "eighty-one million, four hundred seventy-three thousand, eight hundred eight".