81886208 has 22 divisors (see below), whose sum is σ = 163694496. Its totient is φ = 40942592.

The previous prime is 81886201. The next prime is 81886213. The reversal of 81886208 is 80268818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81886201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38960 + ... + 41007.

Almost surely, 2^81886208 is an apocalyptic number.

It is an amenable number.

81886208 is a deficient number, since it is larger than the sum of its proper divisors (81808288).

81886208 is an equidigital number, since it uses as much as digits as its factorization.

81886208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79987 (or 79969 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 41.

The square root of 81886208 is about 9049.0998447359. The cubic root of 81886208 is about 434.2470932546.

The spelling of 81886208 in words is "eighty-one million, eight hundred eighty-six thousand, two hundred eight".