687408202020 has 48 divisors (see below), whose sum is σ = 1924961669568. Its totient is φ = 183288024960.

The previous prime is 687408202003. The next prime is 687408202021. The reversal of 687408202020 is 20202804786.

It is a self number, because there is not a number n which added to its sum of digits gives 687408202020.

It is not an unprimeable number, because it can be changed into a prime (687408202021) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 114814 + ... + 1178133.

It is an arithmetic number, because the mean of its divisors is an integer number (40103368116).

Almost surely, 2^687408202020 is an apocalyptic number.

687408202020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

687408202020 is an abundant number, since it is smaller than the sum of its proper divisors (1237553467548).

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

687408202020 is a wasteful number, since it uses less digits than its factorization.

687408202020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1301820 (or 1301818 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 39.

The spelling of 687408202020 in words is "six hundred eighty-seven billion, four hundred eight million, two hundred two thousand, twenty".