75681563 has 4 divisors (see below), whose sum is σ = 75720720. Its totient is φ = 75642408.

The previous prime is 75681547. The next prime is 75681577. The reversal of 75681563 is 36518657.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 75681563 - 2⁴ = 75681547 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 75681563.

It is not an unprimeable number, because it can be changed into a prime (75681583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16520 + ... + 20597.

It is an arithmetic number, because the mean of its divisors is an integer number (18930180).

Almost surely, 2^75681563 is an apocalyptic number.

75681563 is a deficient number, since it is larger than the sum of its proper divisors (39157).

75681563 is a wasteful number, since it uses less digits than its factorization.

75681563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39156.

The product of its digits is 151200, while the sum is 41.

The square root of 75681563 is about 8699.5151014295. The cubic root of 75681563 is about 422.9899324525.

The spelling of 75681563 in words is "seventy-five million, six hundred eighty-one thousand, five hundred sixty-three".