81000488 has 8 divisors (see below), whose sum is σ = 151875930. Its totient is φ = 40500240.

The previous prime is 81000487. The next prime is 81000523. The reversal of 81000488 is 88400018.

It can be written as a sum of positive squares in only one way, i.e., 56220004 + 24780484 = 7498^2 + 4978^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×81000488² = 13122158112476288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81000488.

It is not an unprimeable number, because it can be changed into a prime (81000481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5062523 + ... + 5062538.

Almost surely, 2^81000488 is an apocalyptic number.

It is an amenable number.

81000488 is a deficient number, since it is larger than the sum of its proper divisors (70875442).

81000488 is a wasteful number, since it uses less digits than its factorization.

81000488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10125067 (or 10125063 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 29.

The square root of 81000488 is about 9000.0271110703. The cubic root of 81000488 is about 432.6757400013.

The spelling of 81000488 in words is "eighty-one million, four hundred eighty-eight", and thus it is an aban number.