81753887 has 4 divisors (see below), whose sum is σ = 82672560. Its totient is φ = 80835216.

The previous prime is 81753863. The next prime is 81753911. The reversal of 81753887 is 78835718.

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

It is an interprime number because it is at equal distance from previous prime (81753863) and next prime (81753911).

It is a cyclic number.

It is not a de Polignac number, because 81753887 - 2¹⁰ = 81752863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81753857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 459203 + ... + 459380.

It is an arithmetic number, because the mean of its divisors is an integer number (20668140).

Almost surely, 2^81753887 is an apocalyptic number.

81753887 is a deficient number, since it is larger than the sum of its proper divisors (918673).

81753887 is an equidigital number, since it uses as much as digits as its factorization.

81753887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918672.

The product of its digits is 376320, while the sum is 47.

The square root of 81753887 is about 9041.7856090487. The cubic root of 81753887 is about 434.0130652908.

The spelling of 81753887 in words is "eighty-one million, seven hundred fifty-three thousand, eight hundred eighty-seven".