81307827670 has 8 divisors (see below), whose sum is σ = 146354089824. Its totient is φ = 32523131064.

The previous prime is 81307827661. The next prime is 81307827673. The reversal of 81307827670 is 7672870318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×81307827670² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81307827673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4065391374 + ... + 4065391393.

It is an arithmetic number, because the mean of its divisors is an integer number (18294261228).

Almost surely, 2^81307827670 is an apocalyptic number.

81307827670 is a deficient number, since it is larger than the sum of its proper divisors (65046262154).

81307827670 is a wasteful number, since it uses less digits than its factorization.

81307827670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8130782774.

The product of its (nonzero) digits is 790272, while the sum is 49.

The spelling of 81307827670 in words is "eighty-one billion, three hundred seven million, eight hundred twenty-seven thousand, six hundred seventy".