81613270 has 16 divisors (see below), whose sum is σ = 148917600. Its totient is φ = 32197824.

The previous prime is 81613261. The next prime is 81613271. The reversal of 81613270 is 7231618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81613271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55170 + ... + 56629.

It is an arithmetic number, because the mean of its divisors is an integer number (9307350).

Almost surely, 2^81613270 is an apocalyptic number.

81613270 is a deficient number, since it is larger than the sum of its proper divisors (67304330).

81613270 is a wasteful number, since it uses less digits than its factorization.

81613270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111879.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 81613270 is about 9034.0063094953. The cubic root of 81613270 is about 433.7640877750.

Adding to 81613270 its reverse (7231618), we get a palindrome (88844888).

The spelling of 81613270 in words is "eighty-one million, six hundred thirteen thousand, two hundred seventy".