81418300 has 18 divisors (see below), whose sum is σ = 176677928. Its totient is φ = 32567280.

The previous prime is 81418297. The next prime is 81418301. The reversal of 81418300 is 381418.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81418301) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 406992 + ... + 407191.

Almost surely, 2^81418300 is an apocalyptic number.

It is an amenable number.

81418300 is an abundant number, since it is smaller than the sum of its proper divisors (95259628).

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

81418300 is a wasteful number, since it uses less digits than its factorization.

81418300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814197 (or 814190 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 81418300 is about 9023.2089635561. The cubic root of 81418300 is about 433.4183988162.

Adding to 81418300 its reverse (381418), we get a palindrome (81799718).

It can be divided in two parts, 81418 and 300, that added together give a palindrome (81718).

The spelling of 81418300 in words is "eighty-one million, four hundred eighteen thousand, three hundred".