686921484 has 12 divisors (see below), whose sum is σ = 1602816824. Its totient is φ = 228973824.

The previous prime is 686921461. The next prime is 686921507. The reversal of 686921484 is 484129686.

It is an interprime number because it is at equal distance from previous prime (686921461) and next prime (686921507).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×686921484² = 943722250361524512, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28621717 + ... + 28621740.

Almost surely, 2^686921484 is an apocalyptic number.

It is an amenable number.

686921484 is an abundant number, since it is smaller than the sum of its proper divisors (915895340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686921484 is a wasteful number, since it uses less digits than its factorization.

686921484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57243464 (or 57243462 counting only the distinct ones).

The product of its digits is 663552, while the sum is 48.

The square root of 686921484 is about 26209.1870152433. The cubic root of 686921484 is about 882.3394552093.

The spelling of 686921484 in words is "six hundred eighty-six million, nine hundred twenty-one thousand, four hundred eighty-four".