687089742920 has 32 divisors (see below), whose sum is σ = 1766802196800. Its totient is φ = 235573626048.

The previous prime is 687089742881. The next prime is 687089742929. The reversal of 687089742920 is 29247980786.

It is not an unprimeable number, because it can be changed into a prime (687089742929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1226945690 + ... + 1226946249.

It is an arithmetic number, because the mean of its divisors is an integer number (55212568650).

Almost surely, 2^687089742920 is an apocalyptic number.

It is an amenable number.

687089742920 is an abundant number, since it is smaller than the sum of its proper divisors (1079712453880).

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

687089742920 is a wasteful number, since it uses less digits than its factorization.

687089742920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2453891957 (or 2453891953 counting only the distinct ones).

The product of its (nonzero) digits is 24385536, while the sum is 62.

The spelling of 687089742920 in words is "six hundred eighty-seven billion, eighty-nine million, seven hundred forty-two thousand, nine hundred twenty".