81448 has 8 divisors (see below), whose sum is σ = 152730. Its totient is φ = 40720.

The previous prime is 81439. The next prime is 81457. The reversal of 81448 is 84418.

It is an interprime number because it is at equal distance from previous prime (81439) and next prime (81457).

It can be written as a sum of positive squares in only one way, i.e., 66564 + 14884 = 258^2 + 122^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5083 + ... + 5098.

2⁸¹⁴⁴⁸ is an apocalyptic number.

It is an amenable number.

81448 is a deficient number, since it is larger than the sum of its proper divisors (71282).

81448 is a wasteful number, since it uses less digits than its factorization.

81448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10187 (or 10183 counting only the distinct ones).

The product of its digits is 1024, while the sum is 25.

The square root of 81448 is about 285.3909599129. The cubic root of 81448 is about 43.3471093610.

It can be divided in two parts, 81 and 448, that added together give a square (529 = 23²).

The spelling of 81448 in words is "eighty-one thousand, four hundred forty-eight".