81856702 has 8 divisors (see below), whose sum is σ = 122836896. Its totient is φ = 40911072.

The previous prime is 81856661. The next prime is 81856703. The reversal of 81856702 is 20765818.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81856703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1558 + ... + 12889.

It is an arithmetic number, because the mean of its divisors is an integer number (15354612).

Almost surely, 2^81856702 is an apocalyptic number.

81856702 is a deficient number, since it is larger than the sum of its proper divisors (40980194).

81856702 is a wasteful number, since it uses less digits than its factorization.

81856702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17282.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 81856702 is about 9047.4693699399. The cubic root of 81856702 is about 434.1949296717.

The spelling of 81856702 in words is "eighty-one million, eight hundred fifty-six thousand, seven hundred two".