81015048 has 24 divisors (see below), whose sum is σ = 219415950. Its totient is φ = 27004992.

The previous prime is 81015043. The next prime is 81015061. The reversal of 81015048 is 84051018.

It can be written as a sum of positive squares in only one way, i.e., 80676324 + 338724 = 8982^2 + 582^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (81015041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 562533 + ... + 562676.

Almost surely, 2^81015048 is an apocalyptic number.

It is an amenable number.

81015048 is an abundant number, since it is smaller than the sum of its proper divisors (138400902).

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

81015048 is a wasteful number, since it uses less digits than its factorization.

81015048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125221 (or 1125214 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 81015048 is about 9000.8359611761. The cubic root of 81015048 is about 432.7016632252.

The spelling of 81015048 in words is "eighty-one million, fifteen thousand, forty-eight".