687286420 has 24 divisors (see below), whose sum is σ = 1456547400. Its totient is φ = 272391552.

The previous prime is 687286409. The next prime is 687286427. The reversal of 687286420 is 24682786.

It can be written as a sum of positive squares in 4 ways, for example, as 227527056 + 459759364 = 15084^2 + 21442^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687286427) 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, 155455 + ... + 159814.

It is an arithmetic number, because the mean of its divisors is an integer number (60689475).

Almost surely, 2^687286420 is an apocalyptic number.

It is an amenable number.

687286420 is an abundant number, since it is smaller than the sum of its proper divisors (769260980).

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

687286420 is a wasteful number, since it uses less digits than its factorization.

687286420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315387 (or 315385 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 43.

The square root of 687286420 is about 26216.1480770917. The cubic root of 687286420 is about 882.4956789961.

The spelling of 687286420 in words is "six hundred eighty-seven million, two hundred eighty-six thousand, four hundred twenty".