1688677405 has 8 divisors (see below), whose sum is σ = 2145613752. Its totient is φ = 1271474688.

The previous prime is 1688677387. The next prime is 1688677427. The reversal of 1688677405 is 5047768861.

It can be written as a sum of positive squares in 4 ways, for example, as 132296004 + 1556381401 = 11502^2 + 39451^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1688677405 - 2⁹ = 1688676893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9933312 + ... + 9933481.

It is an arithmetic number, because the mean of its divisors is an integer number (268201719).

Almost surely, 2^1688677405 is an apocalyptic number.

It is an amenable number.

1688677405 is a deficient number, since it is larger than the sum of its proper divisors (456936347).

1688677405 is a wasteful number, since it uses less digits than its factorization.

1688677405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19866815.

The product of its (nonzero) digits is 2257920, while the sum is 52.

The square root of 1688677405 is about 41093.5202312968. The cubic root of 1688677405 is about 1190.8276155569.

The spelling of 1688677405 in words is "one billion, six hundred eighty-eight million, six hundred seventy-seven thousand, four hundred five".