1689136650 has 72 divisors (see below), whose sum is σ = 4542836844. Its totient is φ = 449971200.

The previous prime is 1689136633. The next prime is 1689136679. The reversal of 1689136650 is 566319861.

It can be written as a sum of positive squares in 6 ways, for example, as 330403329 + 1358733321 = 18177^2 + 36861^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 1689136596 and 1689136605.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 836442 + ... + 838458.

Almost surely, 2^1689136650 is an apocalyptic number.

1689136650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1689136650 is an abundant number, since it is smaller than the sum of its proper divisors (2853700194).

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

1689136650 is a wasteful number, since it uses less digits than its factorization.

1689136650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3896 (or 3888 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 1689136650 is about 41099.1076545465. The cubic root of 1689136650 is about 1190.9355564536.

The spelling of 1689136650 in words is "one billion, six hundred eighty-nine million, one hundred thirty-six thousand, six hundred fifty".