81648755 has 8 divisors (see below), whose sum is σ = 98027712. Its totient is φ = 65286208.

The previous prime is 81648737. The next prime is 81648769. The reversal of 81648755 is 55784618.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81648755 - 2⁶ = 81648691 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 14639 + ... + 19431.

It is an arithmetic number, because the mean of its divisors is an integer number (12253464).

Almost surely, 2^81648755 is an apocalyptic number.

81648755 is a deficient number, since it is larger than the sum of its proper divisors (16378957).

81648755 is a wasteful number, since it uses less digits than its factorization.

81648755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8205.

The product of its digits is 268800, while the sum is 44.

The square root of 81648755 is about 9035.9700641381. The cubic root of 81648755 is about 433.8269447442.

The spelling of 81648755 in words is "eighty-one million, six hundred forty-eight thousand, seven hundred fifty-five".