687080394 has 320 divisors, whose sum is σ = 2185666560. Its totient is φ = 155364480.

The previous prime is 687080389. The next prime is 687080461. The reversal of 687080394 is 493080786.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 3080967 + ... + 3081189.

It is an arithmetic number, because the mean of its divisors is an integer number (6830208).

Almost surely, 2^687080394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687080394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1092833280).

687080394 is an abundant number, since it is smaller than the sum of its proper divisors (1498586166).

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

687080394 is a wasteful number, since it uses less digits than its factorization.

687080394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 687080394 is about 26212.2184105047. The cubic root of 687080394 is about 882.4074890654.

The spelling of 687080394 in words is "six hundred eighty-seven million, eighty thousand, three hundred ninety-four".