687897143 has 4 divisors (see below), whose sum is σ = 688733808. Its totient is φ = 687060480.

The previous prime is 687897127. The next prime is 687897167. The reversal of 687897143 is 341798786.

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 687897143 - 2⁴ = 687897127 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 (687897173) 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, 417098 + ... + 418743.

It is an arithmetic number, because the mean of its divisors is an integer number (172183452).

Almost surely, 2^687897143 is an apocalyptic number.

687897143 is a deficient number, since it is larger than the sum of its proper divisors (836665).

687897143 is an equidigital number, since it uses as much as digits as its factorization.

687897143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836664.

The product of its digits is 2032128, while the sum is 53.

The square root of 687897143 is about 26227.7933307398. The cubic root of 687897143 is about 882.7569969520.

The spelling of 687897143 in words is "six hundred eighty-seven million, eight hundred ninety-seven thousand, one hundred forty-three".