1689051870 has 48 divisors (see below), whose sum is σ = 4790768112. Its totient is φ = 409466880.

The previous prime is 1689051863. The next prime is 1689051877. The reversal of 1689051870 is 781509861.

1689051870 is a `hidden beast` number, since 1 + 68 + 9 + 0 + 518 + 70 = 666.

It is an interprime number because it is at equal distance from previous prime (1689051863) and next prime (1689051877).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689051877) 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 23 ways as a sum of consecutive naturals, for example, 852067 + ... + 854046.

It is an arithmetic number, because the mean of its divisors is an integer number (99807669).

Almost surely, 2^1689051870 is an apocalyptic number.

1689051870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1689051870 is an abundant number, since it is smaller than the sum of its proper divisors (3101716242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1689051870 is a wasteful number, since it uses less digits than its factorization.

1689051870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1706137 (or 1706134 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The square root of 1689051870 is about 41098.0762323494. The cubic root of 1689051870 is about 1190.9156312440.

The spelling of 1689051870 in words is "one billion, six hundred eighty-nine million, fifty-one thousand, eight hundred seventy".