688909252 has 12 divisors (see below), whose sum is σ = 1226025360. Its totient is φ = 338616296.

The previous prime is 688909189. The next prime is 688909259. The reversal of 688909252 is 252909886.

It is a junction number, because it is equal to n+sod(n) for n = 688909196 and 688909205.

It is not an unprimeable number, because it can be changed into a prime (688909259) 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, 1459318 + ... + 1459789.

It is an arithmetic number, because the mean of its divisors is an integer number (102168780).

Almost surely, 2^688909252 is an apocalyptic number.

It is an amenable number.

688909252 is a deficient number, since it is larger than the sum of its proper divisors (537116108).

688909252 is a wasteful number, since it uses less digits than its factorization.

688909252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2919170 (or 2919168 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 49.

The square root of 688909252 is about 26247.0808281607. The cubic root of 688909252 is about 883.1897207926.

The spelling of 688909252 in words is "six hundred eighty-eight million, nine hundred nine thousand, two hundred fifty-two".