81342300 has 72 divisors (see below), whose sum is σ = 253466416. Its totient is φ = 20021760.

The previous prime is 81342277. The next prime is 81342307. The reversal of 81342300 is 324318.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81342307) 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, 6529 + ... + 14328.

Almost surely, 2^81342300 is an apocalyptic number.

It is an amenable number.

81342300 is an abundant number, since it is smaller than the sum of its proper divisors (172124116).

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

81342300 is a wasteful number, since it uses less digits than its factorization.

81342300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20887 (or 20880 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 81342300 is about 9018.9966182497. The cubic root of 81342300 is about 433.2834985426.

Adding to 81342300 its reverse (324318), we get a palindrome (81666618).

The spelling of 81342300 in words is "eighty-one million, three hundred forty-two thousand, three hundred".