688239051 has 12 divisors (see below), whose sum is σ = 959286888. Its totient is φ = 438876064.

The previous prime is 688239031. The next prime is 688239053. The reversal of 688239051 is 150932886.

It is not a de Polignac number, because 688239051 - 2¹⁰ = 688238027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 688238994 and 688239012.

It is not an unprimeable number, because it can be changed into a prime (688239053) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 215250 + ... + 218423.

It is an arithmetic number, because the mean of its divisors is an integer number (79940574).

Almost surely, 2^688239051 is an apocalyptic number.

688239051 is a deficient number, since it is larger than the sum of its proper divisors (271047837).

688239051 is a wasteful number, since it uses less digits than its factorization.

688239051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433722 (or 433699 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 688239051 is about 26234.3105684140. The cubic root of 688239051 is about 882.9032260267.

The spelling of 688239051 in words is "six hundred eighty-eight million, two hundred thirty-nine thousand, fifty-one".