81490048 has 32 divisors (see below), whose sum is σ = 162813420. Its totient is φ = 40627200.

The previous prime is 81490043. The next prime is 81490067. The reversal of 81490048 is 84009418.

It can be written as a sum of positive squares in 2 ways, for example, as 80425024 + 1065024 = 8968^2 + 1032^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 81489995 and 81490022.

It is not an unprimeable number, because it can be changed into a prime (81490043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58318 + ... + 59698.

Almost surely, 2^81490048 is an apocalyptic number.

It is an amenable number.

81490048 is a deficient number, since it is larger than the sum of its proper divisors (81323372).

81490048 is a wasteful number, since it uses less digits than its factorization.

81490048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1856 (or 1844 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 81490048 is about 9027.1838355048. The cubic root of 81490048 is about 433.5456747615.

The spelling of 81490048 in words is "eighty-one million, four hundred ninety thousand, forty-eight".