684686487 has 4 divisors (see below), whose sum is σ = 912915320. Its totient is φ = 456457656.

The previous prime is 684686479. The next prime is 684686501. The reversal of 684686487 is 784686486.

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

It is not a de Polignac number, because 684686487 - 2³ = 684686479 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 (684686417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114114412 + ... + 114114417.

It is an arithmetic number, because the mean of its divisors is an integer number (228228830).

Almost surely, 2^684686487 is an apocalyptic number.

684686487 is a deficient number, since it is larger than the sum of its proper divisors (228228833).

684686487 is a wasteful number, since it uses less digits than its factorization.

684686487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228228832.

The product of its digits is 12386304, while the sum is 57.

The square root of 684686487 is about 26166.5146131463. The cubic root of 684686487 is about 881.3814764050.

Subtracting 684686487 from its reverse (784686486), we obtain a palindrome (99999999).

The spelling of 684686487 in words is "six hundred eighty-four million, six hundred eighty-six thousand, four hundred eighty-seven".