81068670 has 24 divisors (see below), whose sum is σ = 210778776. Its totient is φ = 21618288.

The previous prime is 81068653. The next prime is 81068683. The reversal of 81068670 is 7686018.

It is a super-3 number, since 3×81068670³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

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 11 ways as a sum of consecutive naturals, for example, 450292 + ... + 450471.

It is an arithmetic number, because the mean of its divisors is an integer number (8782449).

Almost surely, 2^81068670 is an apocalyptic number.

81068670 is an abundant number, since it is smaller than the sum of its proper divisors (129710106).

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

81068670 is a wasteful number, since it uses less digits than its factorization.

81068670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900776 (or 900773 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 81068670 is about 9003.8141917745. The cubic root of 81068670 is about 432.7971072693.

The spelling of 81068670 in words is "eighty-one million, sixty-eight thousand, six hundred seventy".