81885063 has 24 divisors (see below), whose sum is σ = 118815312. Its totient is φ = 50139648.

The previous prime is 81885059. The next prime is 81885101. The reversal of 81885063 is 36058818.

It is a happy number.

It is not a de Polignac number, because 81885063 - 2² = 81885059 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81885163) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 188895 + ... + 189327.

It is an arithmetic number, because the mean of its divisors is an integer number (4950638).

Almost surely, 2^81885063 is an apocalyptic number.

81885063 is a deficient number, since it is larger than the sum of its proper divisors (36930249).

81885063 is a wasteful number, since it uses less digits than its factorization.

81885063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835 (or 822 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 81885063 is about 9049.0365785535. The cubic root of 81885063 is about 434.2450692457.

The spelling of 81885063 in words is "eighty-one million, eight hundred eighty-five thousand, sixty-three".