81006072 has 32 divisors (see below), whose sum is σ = 231446400. Its totient is φ = 23144544.

The previous prime is 81006059. The next prime is 81006083. The reversal of 81006072 is 27060018.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 240922 + ... + 241257.

It is an arithmetic number, because the mean of its divisors is an integer number (7232700).

Almost surely, 2^81006072 is an apocalyptic number.

It is an amenable number.

81006072 is an abundant number, since it is smaller than the sum of its proper divisors (150440328).

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

81006072 is a wasteful number, since it uses less digits than its factorization.

81006072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482195 (or 482191 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 81006072 is about 9000.3373270117. The cubic root of 81006072 is about 432.6856823522.

The spelling of 81006072 in words is "eighty-one million, six thousand, seventy-two".