1688375396 has 24 divisors (see below), whose sum is σ = 2982563640. Its totient is φ = 836241152.

The previous prime is 1688375347. The next prime is 1688375399. The reversal of 1688375396 is 6935738861.

It can be written as a sum of positive squares in 4 ways, for example, as 198415396 + 1489960000 = 14086^2 + 38600^2 .

It is a super-2 number, since 2×1688375396² = 5701222955636313632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1688375399) 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 in 7 ways as a sum of consecutive naturals, for example, 275906 + ... + 281958.

It is an arithmetic number, because the mean of its divisors is an integer number (124273485).

Almost surely, 2^1688375396 is an apocalyptic number.

It is an amenable number.

1688375396 is a deficient number, since it is larger than the sum of its proper divisors (1294188244).

1688375396 is a wasteful number, since it uses less digits than its factorization.

1688375396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6703 (or 6701 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 56.

The square root of 1688375396 is about 41089.8454122183. The cubic root of 1688375396 is about 1190.7566207263.

The spelling of 1688375396 in words is "one billion, six hundred eighty-eight million, three hundred seventy-five thousand, three hundred ninety-six".