81029300 has 72 divisors (see below), whose sum is σ = 201966240. Its totient is φ = 27907200.

The previous prime is 81029287. The next prime is 81029309. The reversal of 81029300 is 392018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81029309) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18962 + ... + 22838.

Almost surely, 2^81029300 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 81029300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100983120).

81029300 is an abundant number, since it is smaller than the sum of its proper divisors (120936940).

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

81029300 is a wasteful number, since it uses less digits than its factorization.

81029300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3921 (or 3914 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 81029300 is about 9001.6276306010. The cubic root of 81029300 is about 432.7270350652.

The spelling of 81029300 in words is "eighty-one million, twenty-nine thousand, three hundred".