688887632 has 20 divisors (see below), whose sum is σ = 1335176820. Its totient is φ = 344325888.

The previous prime is 688887631. The next prime is 688887637. The reversal of 688887632 is 236788886.

It can be written as a sum of positive squares in 2 ways, for example, as 547372816 + 141514816 = 23396^2 + 11896^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688887631) 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, 58844 + ... + 69572.

It is an arithmetic number, because the mean of its divisors is an integer number (66758841).

Almost surely, 2^688887632 is an apocalyptic number.

It is an amenable number.

688887632 is a deficient number, since it is larger than the sum of its proper divisors (646289188).

688887632 is a wasteful number, since it uses less digits than its factorization.

688887632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14750 (or 14744 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 56.

The square root of 688887632 is about 26246.6689696045. The cubic root of 688887632 is about 883.1804816649.

The spelling of 688887632 in words is "six hundred eighty-eight million, eight hundred eighty-seven thousand, six hundred thirty-two".