81000588 has 24 divisors (see below), whose sum is σ = 191824192. Its totient is φ = 26596944.

The previous prime is 81000587. The next prime is 81000593. The reversal of 81000588 is 88500018.

It is a super-2 number, since 2×81000588² = 13122190512691488, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81000583) 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, 49570 + ... + 51177.

Almost surely, 2^81000588 is an apocalyptic number.

It is an amenable number.

81000588 is an abundant number, since it is smaller than the sum of its proper divisors (110823604).

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

81000588 is a wasteful number, since it uses less digits than its factorization.

81000588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100821 (or 100819 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 30.

The square root of 81000588 is about 9000.0326666074. The cubic root of 81000588 is about 432.6759180560.

The spelling of 81000588 in words is "eighty-one million, five hundred eighty-eight", and thus it is an aban number.