687987001 has 12 divisors (see below), whose sum is σ = 745746960. Its totient is φ = 634411440.

The previous prime is 687986969. The next prime is 687987007. The reversal of 687987001 is 100789786.

It is not a de Polignac number, because 687987001 - 2⁵ = 687986969 is a prime.

It is a super-2 number, since 2×687987001² = 946652227089948002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687987007) 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 11 ways as a sum of consecutive naturals, for example, 257410 + ... + 260068.

It is an arithmetic number, because the mean of its divisors is an integer number (62145580).

Almost surely, 2^687987001 is an apocalyptic number.

It is an amenable number.

687987001 is a deficient number, since it is larger than the sum of its proper divisors (57759959).

687987001 is a wasteful number, since it uses less digits than its factorization.

687987001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4216 (or 4203 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 687987001 is about 26229.5063049231. The cubic root of 687987001 is about 882.7954326035.

The spelling of 687987001 in words is "six hundred eighty-seven million, nine hundred eighty-seven thousand, one".