81233636 has 12 divisors (see below), whose sum is σ = 155082480. Its totient is φ = 36924360.

The previous prime is 81233627. The next prime is 81233653. The reversal of 81233636 is 63633218.

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, 923066 + ... + 923153.

It is an arithmetic number, because the mean of its divisors is an integer number (12923540).

Almost surely, 2^81233636 is an apocalyptic number.

It is an amenable number.

81233636 is a deficient number, since it is larger than the sum of its proper divisors (73848844).

81233636 is a wasteful number, since it uses less digits than its factorization.

81233636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1846234 (or 1846232 counting only the distinct ones).

The product of its digits is 15552, while the sum is 32.

The square root of 81233636 is about 9012.9704315503. The cubic root of 81233636 is about 433.0904735146.

The spelling of 81233636 in words is "eighty-one million, two hundred thirty-three thousand, six hundred thirty-six".