687428645880 has 64 divisors (see below), whose sum is σ = 2062473127200. Its totient is φ = 183297666560.

The previous prime is 687428645837. The next prime is 687428645887. The reversal of 687428645880 is 88546824786.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687428645887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1096966 + ... + 1605674.

Almost surely, 2^687428645880 is an apocalyptic number.

687428645880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

687428645880 is an abundant number, since it is smaller than the sum of its proper divisors (1375044481320).

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

687428645880 is a wasteful number, since it uses less digits than its factorization.

687428645880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519984 (or 519980 counting only the distinct ones).

The product of its (nonzero) digits is 165150720, while the sum is 66.

The spelling of 687428645880 in words is "six hundred eighty-seven billion, four hundred twenty-eight million, six hundred forty-five thousand, eight hundred eighty".