687818450 has 72 divisors (see below), whose sum is σ = 1467656064. Its totient is φ = 239192800.

The previous prime is 687818437. The next prime is 687818459. The reversal of 687818450 is 54818786.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 687818395 and 687818404.

It is not an unprimeable number, because it can be changed into a prime (687818459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 136679 + ... + 141621.

It is an arithmetic number, because the mean of its divisors is an integer number (20384112).

Almost surely, 2^687818450 is an apocalyptic number.

687818450 is an abundant number, since it is smaller than the sum of its proper divisors (779837614).

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

687818450 is a wasteful number, since it uses less digits than its factorization.

687818450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5000 (or 4984 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 47.

The square root of 687818450 is about 26226.2931044401. The cubic root of 687818450 is about 882.7233342424.

The spelling of 687818450 in words is "six hundred eighty-seven million, eight hundred eighteen thousand, four hundred fifty".