1688091472 has 20 divisors (see below), whose sum is σ = 3271322740. Its totient is φ = 843879168.

The previous prime is 1688091469. The next prime is 1688091473. The reversal of 1688091472 is 2741908861.

It can be written as a sum of positive squares in 2 ways, for example, as 1666598976 + 21492496 = 40824^2 + 4636^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1688091473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133354 + ... + 145462.

It is an arithmetic number, because the mean of its divisors is an integer number (163566137).

Almost surely, 2^1688091472 is an apocalyptic number.

It is an amenable number.

1688091472 is a deficient number, since it is larger than the sum of its proper divisors (1583231268).

1688091472 is a wasteful number, since it uses less digits than its factorization.

1688091472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20830 (or 20824 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 1688091472 is about 41086.3903500904. The cubic root of 1688091472 is about 1190.6898695096.

The spelling of 1688091472 in words is "one billion, six hundred eighty-eight million, ninety-one thousand, four hundred seventy-two".