81148044 has 12 divisors (see below), whose sum is σ = 189345464. Its totient is φ = 27049344.

The previous prime is 81148037. The next prime is 81148057. The reversal of 81148044 is 44084118.

It is a tau number, because it is divible by the number of its divisors (12).

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, 3381157 + ... + 3381180.

Almost surely, 2^81148044 is an apocalyptic number.

It is an amenable number.

81148044 is an abundant number, since it is smaller than the sum of its proper divisors (108197420).

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

81148044 is a wasteful number, since it uses less digits than its factorization.

81148044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6762344 (or 6762342 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 30.

The square root of 81148044 is about 9008.2209120336. The cubic root of 81148044 is about 432.9383111487.

The spelling of 81148044 in words is "eighty-one million, one hundred forty-eight thousand, forty-four".