687389428 has 24 divisors (see below), whose sum is σ = 1328906880. Its totient is φ = 308493120.

The previous prime is 687389399. The next prime is 687389447. The reversal of 687389428 is 824983786.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95401 + ... + 102352.

It is an arithmetic number, because the mean of its divisors is an integer number (55371120).

Almost surely, 2^687389428 is an apocalyptic number.

It is an amenable number.

687389428 is a deficient number, since it is larger than the sum of its proper divisors (641517452).

687389428 is a wasteful number, since it uses less digits than its factorization.

687389428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197847 (or 197845 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 55.

The square root of 687389428 is about 26218.1125941590. The cubic root of 687389428 is about 882.5397652127.

It can be divided in two parts, 687389 and 428, that multiplied together give a palindrome (294202492).

The spelling of 687389428 in words is "six hundred eighty-seven million, three hundred eighty-nine thousand, four hundred twenty-eight".