81600100 has 36 divisors (see below), whose sum is σ = 177832368. Its totient is φ = 32500000.

The previous prime is 81600073. The next prime is 81600137. The reversal of 81600100 is 100618.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23475 + ... + 26725.

It is an arithmetic number, because the mean of its divisors is an integer number (4939788).

Almost surely, 2^81600100 is an apocalyptic number.

It is an amenable number.

81600100 is an abundant number, since it is smaller than the sum of its proper divisors (96232268).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81600100 is a wasteful number, since it uses less digits than its factorization.

81600100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3516 (or 3509 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 81600100 is about 9033.2773676003. The cubic root of 81600100 is about 433.7407542316.

Adding to 81600100 its reverse (100618), we get a palindrome (81700718).

The spelling of 81600100 in words is "eighty-one million, six hundred thousand, one hundred".