1688831048 has 8 divisors (see below), whose sum is σ = 3166558230. Its totient is φ = 844415520.

The previous prime is 1688831047. The next prime is 1688831077. The reversal of 1688831048 is 8401388861.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1546219684 + 142611364 = 39322^2 + 11942^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 1688830993 and 1688831011.

It is not an unprimeable number, because it can be changed into a prime (1688831047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105551933 + ... + 105551948.

Almost surely, 2^1688831048 is an apocalyptic number.

It is an amenable number.

1688831048 is a deficient number, since it is larger than the sum of its proper divisors (1477727182).

1688831048 is a wasteful number, since it uses less digits than its factorization.

1688831048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211103887 (or 211103883 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 47.

The square root of 1688831048 is about 41095.3896197615. The cubic root of 1688831048 is about 1190.8637299697.

The spelling of 1688831048 in words is "one billion, six hundred eighty-eight million, eight hundred thirty-one thousand, forty-eight".