81588060 has 60 divisors (see below), whose sum is σ = 255949848. Its totient is φ = 21756384.

The previous prime is 81588053. The next prime is 81588097. The reversal of 81588060 is 6088518.

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×81588060² = 13313223069127200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 23562 + ... + 26801.

Almost surely, 2^81588060 is an apocalyptic number.

It is an amenable number.

81588060 is an abundant number, since it is smaller than the sum of its proper divisors (174361788).

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

81588060 is a wasteful number, since it uses less digits than its factorization.

81588060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50384 (or 50373 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 81588060 is about 9032.6109182229. The cubic root of 81588060 is about 433.7194205341.

The spelling of 81588060 in words is "eighty-one million, five hundred eighty-eight thousand, sixty".