81641848 has 16 divisors (see below), whose sum is σ = 158016960. Its totient is φ = 39504000.

The previous prime is 81641843. The next prime is 81641849. The reversal of 81641848 is 84814618.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81641848.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81641843) 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, 164353 + ... + 164848.

It is an arithmetic number, because the mean of its divisors is an integer number (9876060).

Almost surely, 2^81641848 is an apocalyptic number.

It is an amenable number.

81641848 is a deficient number, since it is larger than the sum of its proper divisors (76375112).

81641848 is a wasteful number, since it uses less digits than its factorization.

81641848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329238 (or 329234 counting only the distinct ones).

The product of its digits is 49152, while the sum is 40.

The square root of 81641848 is about 9035.5878613403. The cubic root of 81641848 is about 433.8147113378.

The spelling of 81641848 in words is "eighty-one million, six hundred forty-one thousand, eight hundred forty-eight".