81656846 has 8 divisors (see below), whose sum is σ = 122523624. Its totient is φ = 40815640.

The previous prime is 81656819. The next prime is 81656873. The reversal of 81656846 is 64865618.

It is an interprime number because it is at equal distance from previous prime (81656819) and next prime (81656873).

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

It is a junction number, because it is equal to n+sod(n) for n = 81656797 and 81656806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9161 + ... + 15723.

It is an arithmetic number, because the mean of its divisors is an integer number (15315453).

Almost surely, 2^81656846 is an apocalyptic number.

81656846 is a deficient number, since it is larger than the sum of its proper divisors (40866778).

81656846 is a wasteful number, since it uses less digits than its factorization.

81656846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12786.

The product of its digits is 276480, while the sum is 44.

The square root of 81656846 is about 9036.4177636938. The cubic root of 81656846 is about 433.8412743274.

The spelling of 81656846 in words is "eighty-one million, six hundred fifty-six thousand, eight hundred forty-six".