689516550 has 120 divisors (see below), whose sum is σ = 1947939312. Its totient is φ = 180792000.

The previous prime is 689516533. The next prime is 689516551. The reversal of 689516550 is 55615986.

It is a happy number.

689516550 is a `hidden beast` number, since 6 + 8 + 95 + 1 + 6 + 550 = 666.

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 = 689516496 and 689516505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689516551) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 245655 + ... + 248445.

Almost surely, 2^689516550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 689516550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (973969656).

689516550 is an abundant number, since it is smaller than the sum of its proper divisors (1258422762).

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

689516550 is a wasteful number, since it uses less digits than its factorization.

689516550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2876 (or 2862 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 45.

The square root of 689516550 is about 26258.6471471780. The cubic root of 689516550 is about 883.4491656179.

The spelling of 689516550 in words is "six hundred eighty-nine million, five hundred sixteen thousand, five hundred fifty".