81383600 has 30 divisors (see below), whose sum is σ = 195525060. Its totient is φ = 32553280.

The previous prime is 81383581. The next prime is 81383611. The reversal of 81383600 is 638318.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 101330 + ... + 102129.

It is an arithmetic number, because the mean of its divisors is an integer number (6517502).

Almost surely, 2^81383600 is an apocalyptic number.

81383600 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81383600 is an abundant number, since it is smaller than the sum of its proper divisors (114141460).

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

81383600 is a wasteful number, since it uses less digits than its factorization.

81383600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203477 (or 203466 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 81383600 is about 9021.2859393769. The cubic root of 81383600 is about 433.3568166103.

The spelling of 81383600 in words is "eighty-one million, three hundred eighty-three thousand, six hundred".