687565742 has 4 divisors (see below), whose sum is σ = 1031348616. Its totient is φ = 343782870.

The previous prime is 687565741. The next prime is 687565793. The reversal of 687565742 is 247565786.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687565741) 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 as a sum of consecutive naturals, namely, 171891434 + ... + 171891437.

It is an arithmetic number, because the mean of its divisors is an integer number (257837154).

Almost surely, 2^687565742 is an apocalyptic number.

687565742 is a deficient number, since it is larger than the sum of its proper divisors (343782874).

687565742 is a wasteful number, since it uses less digits than its factorization.

687565742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343782873.

The product of its digits is 2822400, while the sum is 50.

The square root of 687565742 is about 26221.4748250361. The cubic root of 687565742 is about 882.6152153179.

The spelling of 687565742 in words is "six hundred eighty-seven million, five hundred sixty-five thousand, seven hundred forty-two".