687946052 has 12 divisors (see below), whose sum is σ = 1233269436. Its totient is φ = 335583360.

The previous prime is 687946043. The next prime is 687946057. The reversal of 687946052 is 250649786.

It can be written as a sum of positive squares in 2 ways, for example, as 130325056 + 557620996 = 11416^2 + 23614^2 .

It is a junction number, because it is equal to n+sod(n) for n = 687945988 and 687946006.

It is not an unprimeable number, because it can be changed into a prime (687946057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2097233 + ... + 2097560.

It is an arithmetic number, because the mean of its divisors is an integer number (102772453).

Almost surely, 2^687946052 is an apocalyptic number.

It is an amenable number.

687946052 is a deficient number, since it is larger than the sum of its proper divisors (545323384).

687946052 is a wasteful number, since it uses less digits than its factorization.

687946052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4194838 (or 4194836 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 687946052 is about 26228.7257029388. The cubic root of 687946052 is about 882.7779175888. Note that the first 3 decimals are identical.

The spelling of 687946052 in words is "six hundred eighty-seven million, nine hundred forty-six thousand, fifty-two".