81194800 has 30 divisors (see below), whose sum is σ = 195071468. Its totient is φ = 32477760.

The previous prime is 81194791. The next prime is 81194891. The reversal of 81194800 is 849118.

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, 101094 + ... + 101893.

Almost surely, 2^81194800 is an apocalyptic number.

81194800 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81194800 is an abundant number, since it is smaller than the sum of its proper divisors (113876668).

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

81194800 is a wasteful number, since it uses less digits than its factorization.

81194800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203005 (or 202994 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 81194800 is about 9010.8157233405. The cubic root of 81194800 is about 433.0214455294.

The spelling of 81194800 in words is "eighty-one million, one hundred ninety-four thousand, eight hundred".