81288006 has 16 divisors (see below), whose sum is σ = 163613424. Its totient is φ = 26923104.

The previous prime is 81287977. The next prime is 81288013. The reversal of 81288006 is 60088218.

It is a super-4 number, since 4×81288006⁴ (a number of 33 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 42205 + ... + 44088.

It is an arithmetic number, because the mean of its divisors is an integer number (10225839).

Almost surely, 2^81288006 is an apocalyptic number.

81288006 is an abundant number, since it is smaller than the sum of its proper divisors (82325418).

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

81288006 is a wasteful number, since it uses less digits than its factorization.

81288006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86455.

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 81288006 is about 9015.9861357480. The cubic root of 81288006 is about 433.1870750324.

The spelling of 81288006 in words is "eighty-one million, two hundred eighty-eight thousand, six".