81702007 has 4 divisors (see below), whose sum is σ = 82116936. Its totient is φ = 81287080.

The previous prime is 81702001. The next prime is 81702013. The reversal of 81702007 is 70020718.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70020718 = 2 ⋅35010359.

It is an interprime number because it is at equal distance from previous prime (81702001) and next prime (81702013).

It is a cyclic number.

It is not a de Polignac number, because 81702007 - 2³ = 81701999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81702001) 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 3 ways as a sum of consecutive naturals, for example, 207169 + ... + 207562.

It is an arithmetic number, because the mean of its divisors is an integer number (20529234).

Almost surely, 2^81702007 is an apocalyptic number.

81702007 is a deficient number, since it is larger than the sum of its proper divisors (414929).

81702007 is a wasteful number, since it uses less digits than its factorization.

81702007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414928.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 81702007 is about 9038.9162514098. The cubic root of 81702007 is about 433.9212394329.

The spelling of 81702007 in words is "eighty-one million, seven hundred two thousand, seven".