688515052 has 24 divisors (see below), whose sum is σ = 1226136800. Its totient is φ = 338204160.

The previous prime is 688515043. The next prime is 688515083. The reversal of 688515052 is 250515886.

It is a junction number, because it is equal to n+sod(n) for n = 688514996 and 688515014.

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, 340348 + ... + 342364.

Almost surely, 2^688515052 is an apocalyptic number.

It is an amenable number.

688515052 is a deficient number, since it is larger than the sum of its proper divisors (537621748).

688515052 is a wasteful number, since it uses less digits than its factorization.

688515052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3481 (or 3479 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 40.

The square root of 688515052 is about 26239.5703470922. The cubic root of 688515052 is about 883.0212323143.

The spelling of 688515052 in words is "six hundred eighty-eight million, five hundred fifteen thousand, fifty-two".