81048138 has 32 divisors (see below), whose sum is σ = 165644160. Its totient is φ = 26429760.

The previous prime is 81048137. The next prime is 81048169. The reversal of 81048138 is 83184018.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81048099 and 81048108.

It is not an unprimeable number, because it can be changed into a prime (81048131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83331 + ... + 84297.

It is an arithmetic number, because the mean of its divisors is an integer number (5176380).

Almost surely, 2^81048138 is an apocalyptic number.

81048138 is an abundant number, since it is smaller than the sum of its proper divisors (84596022).

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

81048138 is a wasteful number, since it uses less digits than its factorization.

81048138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262.

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 81048138 is about 9002.6739361148. The cubic root of 81048138 is about 432.7605664761.

The spelling of 81048138 in words is "eighty-one million, forty-eight thousand, one hundred thirty-eight".