81200108 has 12 divisors (see below), whose sum is σ = 155018472. Its totient is φ = 36909120.

The previous prime is 81200059. The next prime is 81200113. The reversal of 81200108 is 80100218.

It is a self number, because there is not a number n which added to its sum of digits gives 81200108.

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, 922685 + ... + 922772.

It is an arithmetic number, because the mean of its divisors is an integer number (12918206).

Almost surely, 2^81200108 is an apocalyptic number.

It is an amenable number.

81200108 is a deficient number, since it is larger than the sum of its proper divisors (73818364).

81200108 is a wasteful number, since it uses less digits than its factorization.

81200108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845472 (or 1845470 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 81200108 is about 9011.1102534593. The cubic root of 81200108 is about 433.0308813871.

The spelling of 81200108 in words is "eighty-one million, two hundred thousand, one hundred eight".