81182000 has 40 divisors (see below), whose sum is σ = 196302912. Its totient is φ = 32472000.

The previous prime is 81181993. The next prime is 81182011. The reversal of 81182000 is 28118.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18296 + ... + 22295.

Almost surely, 2^81182000 is an apocalyptic number.

81182000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81182000 is an abundant number, since it is smaller than the sum of its proper divisors (115120912).

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

81182000 is a wasteful number, since it uses less digits than its factorization.

81182000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40614 (or 40598 counting only the distinct ones).

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

The square root of 81182000 is about 9010.1054377848. The cubic root of 81182000 is about 432.9986896969.

The spelling of 81182000 in words is "eighty-one million, one hundred eighty-two thousand".