81436200 has 48 divisors (see below), whose sum is σ = 252454080. Its totient is φ = 21716160.

The previous prime is 81436193. The next prime is 81436211. The reversal of 81436200 is 263418.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67264 + ... + 68463.

It is an arithmetic number, because the mean of its divisors is an integer number (5259460).

Almost surely, 2^81436200 is an apocalyptic number.

It is an amenable number.

81436200 is an abundant number, since it is smaller than the sum of its proper divisors (171017880).

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

81436200 is a wasteful number, since it uses less digits than its factorization.

81436200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135746 (or 135737 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 81436200 is about 9024.2007956384. The cubic root of 81436200 is about 433.4501591652.

Adding to 81436200 its reverse (263418), we get a palindrome (81699618).

The spelling of 81436200 in words is "eighty-one million, four hundred thirty-six thousand, two hundred".