81457044 has 12 divisors (see below), whose sum is σ = 190066464. Its totient is φ = 27152344.

The previous prime is 81457039. The next prime is 81457069. The reversal of 81457044 is 44075418.

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

It is a junction number, because it is equal to n+sod(n) for n = 81456996 and 81457014.

It is a congruent number.

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, 3394032 + ... + 3394055.

It is an arithmetic number, because the mean of its divisors is an integer number (15838872).

Almost surely, 2^81457044 is an apocalyptic number.

It is an amenable number.

81457044 is an abundant number, since it is smaller than the sum of its proper divisors (108609420).

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

81457044 is a wasteful number, since it uses less digits than its factorization.

81457044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6788094 (or 6788092 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 33.

The square root of 81457044 is about 9025.3556162624. The cubic root of 81457044 is about 433.4871372511.

The spelling of 81457044 in words is "eighty-one million, four hundred fifty-seven thousand, forty-four".