81436030 has 24 divisors (see below), whose sum is σ = 158731272. Its totient is φ = 30068064.

The previous prime is 81436013. The next prime is 81436051. The reversal of 81436030 is 3063418.

It is a junction number, because it is equal to n+sod(n) for n = 81435986 and 81436004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22404 + ... + 25783.

It is an arithmetic number, because the mean of its divisors is an integer number (6613803).

Almost surely, 2^81436030 is an apocalyptic number.

81436030 is a deficient number, since it is larger than the sum of its proper divisors (77295242).

81436030 is a wasteful number, since it uses less digits than its factorization.

81436030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48220 (or 48207 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 81436030 is about 9024.1913765168. The cubic root of 81436030 is about 433.4498575525.

Adding to 81436030 its reverse (3063418), we get a palindrome (84499448).

The spelling of 81436030 in words is "eighty-one million, four hundred thirty-six thousand, thirty".