1688388534 has 48 divisors (see below), whose sum is σ = 4185762048. Its totient is φ = 481820976.

The previous prime is 1688388521. The next prime is 1688388539. The reversal of 1688388534 is 4358838861.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1688388539) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104209 + ... + 119315.

It is an arithmetic number, because the mean of its divisors is an integer number (87203376).

Almost surely, 2^1688388534 is an apocalyptic number.

1688388534 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1688388534 is an abundant number, since it is smaller than the sum of its proper divisors (2497373514).

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

1688388534 is a wasteful number, since it uses less digits than its factorization.

1688388534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16009 (or 16006 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 54.

The square root of 1688388534 is about 41090.0052810900. The cubic root of 1688388534 is about 1190.7597093206.

The spelling of 1688388534 in words is "one billion, six hundred eighty-eight million, three hundred eighty-eight thousand, five hundred thirty-four".