687671420 has 48 divisors (see below), whose sum is σ = 1532478528. Its totient is φ = 258309120.

The previous prime is 687671399. The next prime is 687671441. The reversal of 687671420 is 24176786.

687671420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (687671399) and next prime (687671441).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169010 + ... + 173030.

It is an arithmetic number, because the mean of its divisors is an integer number (31926636).

Almost surely, 2^687671420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687671420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (766239264).

687671420 is an abundant number, since it is smaller than the sum of its proper divisors (844807108).

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

687671420 is a wasteful number, since it uses less digits than its factorization.

687671420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4550 (or 4548 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 687671420 is about 26223.4898516578. The cubic root of 687671420 is about 882.6604319553.

The spelling of 687671420 in words is "six hundred eighty-seven million, six hundred seventy-one thousand, four hundred twenty".