688240936 has 16 divisors (see below), whose sum is σ = 1295048340. Its totient is φ = 342894720.

The previous prime is 688240879. The next prime is 688240991. The reversal of 688240936 is 639042886.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 680896836 + 7344100 = 26094^2 + 2710^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150831 + ... + 155326.

Almost surely, 2^688240936 is an apocalyptic number.

It is an amenable number.

688240936 is a deficient number, since it is larger than the sum of its proper divisors (606807404).

688240936 is a wasteful number, since it uses less digits than its factorization.

688240936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306444 (or 306440 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 46.

The square root of 688240936 is about 26234.3464946242. The cubic root of 688240936 is about 882.9040320795.

The spelling of 688240936 in words is "six hundred eighty-eight million, two hundred forty thousand, nine hundred thirty-six".