1687390071 has 8 divisors (see below), whose sum is σ = 2275133040. Its totient is φ = 1112286912.

The previous prime is 1687390021. The next prime is 1687390121. The reversal of 1687390071 is 1700937861.

It is an interprime number because it is at equal distance from previous prime (1687390021) and next prime (1687390121).

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

It is not a de Polignac number, because 1687390071 - 2⁹ = 1687389559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1687390021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3159640 + ... + 3160173.

It is an arithmetic number, because the mean of its divisors is an integer number (284391630).

Almost surely, 2^1687390071 is an apocalyptic number.

1687390071 is a deficient number, since it is larger than the sum of its proper divisors (587742969).

1687390071 is an equidigital number, since it uses as much as digits as its factorization.

1687390071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6319905.

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 1687390071 is about 41077.8537779179. The cubic root of 1687390071 is about 1190.5249363540.

The spelling of 1687390071 in words is "one billion, six hundred eighty-seven million, three hundred ninety thousand, seventy-one".