81600684 has 48 divisors (see below), whose sum is σ = 208293120. Its totient is φ = 24658240.

The previous prime is 81600683. The next prime is 81600689. The reversal of 81600684 is 48600618.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (81600683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65782 + ... + 67010.

It is an arithmetic number, because the mean of its divisors is an integer number (4339440).

Almost surely, 2^81600684 is an apocalyptic number.

It is an amenable number.

81600684 is an abundant number, since it is smaller than the sum of its proper divisors (126692436).

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

81600684 is a wasteful number, since it uses less digits than its factorization.

81600684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1750 (or 1748 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 81600684 is about 9033.3096924660. The cubic root of 81600684 is about 433.7417889689.

The spelling of 81600684 in words is "eighty-one million, six hundred thousand, six hundred eighty-four".