81544808 has 16 divisors (see below), whose sum is σ = 160944000. Its totient is φ = 38626416.

The previous prime is 81544783. The next prime is 81544811. The reversal of 81544808 is 80844518.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268088 + ... + 268391.

It is an arithmetic number, because the mean of its divisors is an integer number (10059000).

Almost surely, 2^81544808 is an apocalyptic number.

It is an amenable number.

81544808 is a deficient number, since it is larger than the sum of its proper divisors (79399192).

81544808 is a wasteful number, since it uses less digits than its factorization.

81544808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536504 (or 536500 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 38.

The square root of 81544808 is about 9030.2163872191. The cubic root of 81544808 is about 433.6427649210.

The spelling of 81544808 in words is "eighty-one million, five hundred forty-four thousand, eight hundred eight".