688850240 has 56 divisors (see below), whose sum is σ = 1766514120. Its totient is φ = 254343168.

The previous prime is 688850221. The next prime is 688850273. The reversal of 688850240 is 42058886.

It can be written as a sum of positive squares in 4 ways, for example, as 9935104 + 678915136 = 3152^2 + 26056^2 .

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, 78635 + ... + 86954.

It is an arithmetic number, because the mean of its divisors is an integer number (31544895).

Almost surely, 2^688850240 is an apocalyptic number.

It is an amenable number.

688850240 is an abundant number, since it is smaller than the sum of its proper divisors (1077663880).

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

688850240 is a wasteful number, since it uses less digits than its factorization.

688850240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165619 (or 165609 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 41.

The square root of 688850240 is about 26245.9566409761. The cubic root of 688850240 is about 883.1645020477.

The spelling of 688850240 in words is "six hundred eighty-eight million, eight hundred fifty thousand, two hundred forty".