81648135 has 16 divisors (see below), whose sum is σ = 145152480. Its totient is φ = 43545600.

The previous prime is 81648131. The next prime is 81648139. The reversal of 81648135 is 53184618.

81648135 is a `hidden beast` number, since 8 + 1 + 648 + 1 + 3 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (81648131) and next prime (81648139).

It is not a de Polignac number, because 81648135 - 2² = 81648131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81648135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81648131) 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, 302266 + ... + 302535.

It is an arithmetic number, because the mean of its divisors is an integer number (9072030).

Almost surely, 2^81648135 is an apocalyptic number.

81648135 is a deficient number, since it is larger than the sum of its proper divisors (63504345).

81648135 is a wasteful number, since it uses less digits than its factorization.

81648135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604815 (or 604809 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 81648135 is about 9035.9357567437. The cubic root of 81648135 is about 433.8258466528.

The spelling of 81648135 in words is "eighty-one million, six hundred forty-eight thousand, one hundred thirty-five".