81480044 has 6 divisors (see below), whose sum is σ = 142590084. Its totient is φ = 40740020.

The previous prime is 81480043. The next prime is 81480067. The reversal of 81480044 is 44008418.

It is a junction number, because it is equal to n+sod(n) for n = 81479989 and 81480016.

It is not an unprimeable number, because it can be changed into a prime (81480041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10185002 + ... + 10185009.

It is an arithmetic number, because the mean of its divisors is an integer number (23765014).

Almost surely, 2^81480044 is an apocalyptic number.

It is an amenable number.

81480044 is a deficient number, since it is larger than the sum of its proper divisors (61110040).

81480044 is a wasteful number, since it uses less digits than its factorization.

81480044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20370015 (or 20370013 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 81480044 is about 9026.6297143508. The cubic root of 81480044 is about 433.5279328468.

The spelling of 81480044 in words is "eighty-one million, four hundred eighty thousand, forty-four".