687523420 has 24 divisors (see below), whose sum is σ = 1471042944. Its totient is φ = 269820096.

The previous prime is 687523411. The next prime is 687523423. The reversal of 687523420 is 24325786.

It is a self number, because there is not a number n which added to its sum of digits gives 687523420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687523423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323244 + ... + 325363.

It is an arithmetic number, because the mean of its divisors is an integer number (61293456).

Almost surely, 2^687523420 is an apocalyptic number.

It is an amenable number.

687523420 is an abundant number, since it is smaller than the sum of its proper divisors (783519524).

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

687523420 is a wasteful number, since it uses less digits than its factorization.

687523420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648669 (or 648667 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 687523420 is about 26220.6678023272. The cubic root of 687523420 is about 882.5971056278.

The spelling of 687523420 in words is "six hundred eighty-seven million, five hundred twenty-three thousand, four hundred twenty".