81428548 has 12 divisors (see below), whose sum is σ = 142750972. Its totient is φ = 40642560.

The previous prime is 81428531. The next prime is 81428569. The reversal of 81428548 is 84582418.

It can be written as a sum of positive squares in 2 ways, for example, as 55234624 + 26193924 = 7432^2 + 5118^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 81428548.

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, 15333 + ... + 19948.

Almost surely, 2^81428548 is an apocalyptic number.

It is an amenable number.

81428548 is a deficient number, since it is larger than the sum of its proper divisors (61322424).

81428548 is a wasteful number, since it uses less digits than its factorization.

81428548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35862 (or 35860 counting only the distinct ones).

The product of its digits is 81920, while the sum is 40.

The square root of 81428548 is about 9023.7768146159. The cubic root of 81428548 is about 433.4365826292.

The spelling of 81428548 in words is "eighty-one million, four hundred twenty-eight thousand, five hundred forty-eight".