687438306 has 64 divisors (see below), whose sum is σ = 1601683200. Its totient is φ = 218135808.

The previous prime is 687438293. The next prime is 687438313. The reversal of 687438306 is 603834786.

It is a super-2 number, since 2×687438306² = 945142849112299272, which contains 22 as substring.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 283210 + ... + 285626.

It is an arithmetic number, because the mean of its divisors is an integer number (25026300).

Almost surely, 2^687438306 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687438306, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (800841600).

687438306 is an abundant number, since it is smaller than the sum of its proper divisors (914244894).

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

687438306 is a wasteful number, since it uses less digits than its factorization.

687438306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2680 (or 2674 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The square root of 687438306 is about 26219.0447194401. The cubic root of 687438306 is about 882.5606828830.

The spelling of 687438306 in words is "six hundred eighty-seven million, four hundred thirty-eight thousand, three hundred six".