81415936 has 36 divisors (see below), whose sum is σ = 185734192. Its totient is φ = 34891776.

The previous prime is 81415903. The next prime is 81415991. The reversal of 81415936 is 63951418.

It is a junction number, because it is equal to n+sod(n) for n = 81415895 and 81415904.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20925 + ... + 24508.

Almost surely, 2^81415936 is an apocalyptic number.

It is an amenable number.

81415936 is an abundant number, since it is smaller than the sum of its proper divisors (104318256).

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

81415936 is an equidigital number, since it uses as much as digits as its factorization.

81415936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45456 (or 45442 counting only the distinct ones).

The product of its digits is 25920, while the sum is 37.

The square root of 81415936 is about 9023.0779670797. The cubic root of 81415936 is about 433.4142039730.

The spelling of 81415936 in words is "eighty-one million, four hundred fifteen thousand, nine hundred thirty-six".