81636848 has 10 divisors (see below), whose sum is σ = 158171424. Its totient is φ = 40818416.

The previous prime is 81636829. The next prime is 81636851. The reversal of 81636848 is 84863618.

It is a junction number, because it is equal to n+sod(n) for n = 81636799 and 81636808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2551136 + ... + 2551167.

Almost surely, 2^81636848 is an apocalyptic number.

It is an amenable number.

81636848 is a deficient number, since it is larger than the sum of its proper divisors (76534576).

81636848 is a wasteful number, since it uses less digits than its factorization.

81636848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5102311 (or 5102305 counting only the distinct ones).

The product of its digits is 221184, while the sum is 44.

The square root of 81636848 is about 9035.3111733908. The cubic root of 81636848 is about 433.8058551042.

The spelling of 81636848 in words is "eighty-one million, six hundred thirty-six thousand, eight hundred forty-eight".