81000048 has 40 divisors (see below), whose sum is σ = 210192400. Its totient is φ = 26878464.

The previous prime is 81000047. The next prime is 81000061. The reversal of 81000048 is 84000018.

It is a super-2 number, since 2×81000048² = 13122015552004608, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 80999988 and 81000033.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81000041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7308 + ... + 14676.

It is an arithmetic number, because the mean of its divisors is an integer number (5254810).

Almost surely, 2^81000048 is an apocalyptic number.

It is an amenable number.

81000048 is an abundant number, since it is smaller than the sum of its proper divisors (129192352).

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

81000048 is a wasteful number, since it uses less digits than its factorization.

81000048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7609 (or 7603 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 81000048 is about 9000.0026666663. The cubic root of 81000048 is about 432.6749565588.

The spelling of 81000048 in words is "eighty-one million, forty-eight", and thus it is an aban number and an uban number.