687515004128 has 12 divisors (see below), whose sum is σ = 1353545164440. Its totient is φ = 343757502048.

The previous prime is 687515004079. The next prime is 687515004131. The reversal of 687515004128 is 821400515786.

It is a super-2 number, since 2×687515004128² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10742421908 + ... + 10742421971.

It is an arithmetic number, because the mean of its divisors is an integer number (112795430370).

Almost surely, 2^687515004128 is an apocalyptic number.

It is an amenable number.

687515004128 is a deficient number, since it is larger than the sum of its proper divisors (666030160312).

687515004128 is a wasteful number, since it uses less digits than its factorization.

687515004128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21484843889 (or 21484843881 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 47.

The spelling of 687515004128 in words is "six hundred eighty-seven billion, five hundred fifteen million, four thousand, one hundred twenty-eight".