688239054 has 12 divisors (see below), whose sum is σ = 1491184656. Its totient is φ = 229413012.

The previous prime is 688239053. The next prime is 688239089. The reversal of 688239054 is 450932886.

It is a Curzon number.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 19117734 + ... + 19117769.

It is an arithmetic number, because the mean of its divisors is an integer number (124265388).

Almost surely, 2^688239054 is an apocalyptic number.

688239054 is an abundant number, since it is smaller than the sum of its proper divisors (802945602).

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

688239054 is a wasteful number, since it uses less digits than its factorization.

688239054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38235511 (or 38235508 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 688239054 is about 26234.3106255911. The cubic root of 688239054 is about 882.9032273095.

It can be divided in two parts, 68823 and 9054, that added together give a palindrome (77877).

The spelling of 688239054 in words is "six hundred eighty-eight million, two hundred thirty-nine thousand, fifty-four".