81770007 has 16 divisors (see below), whose sum is σ = 119634048. Its totient is φ = 49267680.

The previous prime is 81769997. The next prime is 81770009. The reversal of 81770007 is 70007718.

It is not a de Polignac number, because 81770007 - 2⁶ = 81769943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81770009) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1453 + ... + 12870.

It is an arithmetic number, because the mean of its divisors is an integer number (7477128).

Almost surely, 2^81770007 is an apocalyptic number.

81770007 is a deficient number, since it is larger than the sum of its proper divisors (37864041).

81770007 is a wasteful number, since it uses less digits than its factorization.

81770007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14510.

The product of its (nonzero) digits is 2744, while the sum is 30.

The square root of 81770007 is about 9042.6769819562. The cubic root of 81770007 is about 434.0415892386.

The spelling of 81770007 in words is "eighty-one million, seven hundred seventy thousand, seven".