81542300 has 72 divisors (see below), whose sum is σ = 212903040. Its totient is φ = 26481600.

The previous prime is 81542297. The next prime is 81542323. The reversal of 81542300 is 324518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10235 + ... + 16365.

Almost surely, 2^81542300 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81542300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106451520).

81542300 is an abundant number, since it is smaller than the sum of its proper divisors (131360740).

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

81542300 is a wasteful number, since it uses less digits than its factorization.

81542300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6171 (or 6164 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 81542300 is about 9030.0775190471. The cubic root of 81542300 is about 433.6383191558.

Adding to 81542300 its reverse (324518), we get a palindrome (81866818).

The spelling of 81542300 in words is "eighty-one million, five hundred forty-two thousand, three hundred".