687189012 has 24 divisors (see below), whose sum is σ = 1646778336. Its totient is φ = 222871968.

The previous prime is 687188981. The next prime is 687189023. The reversal of 687189012 is 210981786.

It is a super-2 number, since 2×687189012² = 944457476427072288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 773418 + ... + 774305.

It is an arithmetic number, because the mean of its divisors is an integer number (68615764).

Almost surely, 2^687189012 is an apocalyptic number.

It is an amenable number.

687189012 is an abundant number, since it is smaller than the sum of its proper divisors (959589324).

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

687189012 is a wasteful number, since it uses less digits than its factorization.

687189012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547767 (or 1547765 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 42.

The square root of 687189012 is about 26214.2902249899. The cubic root of 687189012 is about 882.4539854615.

The spelling of 687189012 in words is "six hundred eighty-seven million, one hundred eighty-nine thousand, twelve".