1689511356 has 72 divisors (see below), whose sum is σ = 4607466864. Its totient is φ = 518918400.

The previous prime is 1689511349. The next prime is 1689511361. The reversal of 1689511356 is 6531159861.

1689511356 is a `hidden beast` number, since 1 + 6 + 89 + 511 + 3 + 56 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 285831 + ... + 291681.

Almost surely, 2^1689511356 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1689511356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2303733432).

1689511356 is an abundant number, since it is smaller than the sum of its proper divisors (2917955508).

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

1689511356 is a wasteful number, since it uses less digits than its factorization.

1689511356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6491 (or 6486 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The square root of 1689511356 is about 41103.6659678915. The cubic root of 1689511356 is about 1191.0236128196.

The spelling of 1689511356 in words is "one billion, six hundred eighty-nine million, five hundred eleven thousand, three hundred fifty-six".