81230000 has 50 divisors (see below), whose sum is σ = 196690164. Its totient is φ = 32488000.

The previous prime is 81229999. The next prime is 81230011. The reversal of 81230000 is 3218.

It is a tau number, because it is divible by the number of its divisors (50).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5939 + ... + 14061.

Almost surely, 2^81230000 is an apocalyptic number.

81230000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81230000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98345082).

81230000 is an abundant number, since it is smaller than the sum of its proper divisors (115460164).

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

81230000 is an equidigital number, since it uses as much as digits as its factorization.

81230000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8151 (or 8130 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 81230000 is about 9012.7687199883. The cubic root of 81230000 is about 433.0840117395.

Adding to 81230000 its reverse (3218), we get a palindrome (81233218).

The spelling of 81230000 in words is "eighty-one million, two hundred thirty thousand".