81334270 has 16 divisors (see below), whose sum is σ = 151450560. Its totient is φ = 31411744.

The previous prime is 81334249. The next prime is 81334271. The reversal of 81334270 is 7243318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81334271) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 139942 + ... + 140521.

It is an arithmetic number, because the mean of its divisors is an integer number (9465660).

Almost surely, 2^81334270 is an apocalyptic number.

81334270 is a deficient number, since it is larger than the sum of its proper divisors (70116290).

81334270 is a wasteful number, since it uses less digits than its factorization.

81334270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280499.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 81334270 is about 9018.5514357906. The cubic root of 81334270 is about 433.2692403563.

Adding to 81334270 its reverse (7243318), we get a palindrome (88577588).

It can be divided in two parts, 8133 and 4270, that added together give a triangular number (12403 = T₁₅₇).

The spelling of 81334270 in words is "eighty-one million, three hundred thirty-four thousand, two hundred seventy".