81653260 has 48 divisors (see below), whose sum is σ = 194392800. Its totient is φ = 28560384.

The previous prime is 81653251. The next prime is 81653267. The reversal of 81653260 is 6235618.

It is not an unprimeable number, because it can be changed into a prime (81653267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3325 + ... + 13204.

It is an arithmetic number, because the mean of its divisors is an integer number (4049850).

Almost surely, 2^81653260 is an apocalyptic number.

It is an amenable number.

81653260 is an abundant number, since it is smaller than the sum of its proper divisors (112739540).

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

81653260 is a wasteful number, since it uses less digits than its factorization.

81653260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16570 (or 16568 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 81653260 is about 9036.2193421807. The cubic root of 81653260 is about 433.8349234511.

Adding to 81653260 its reverse (6235618), we get a palindrome (87888878).

The spelling of 81653260 in words is "eighty-one million, six hundred fifty-three thousand, two hundred sixty".