689750985 has 64 divisors (see below), whose sum is σ = 1380685824. Its totient is φ = 285657600.

The previous prime is 689750981. The next prime is 689750987. The reversal of 689750985 is 589057986.

It is not a de Polignac number, because 689750985 - 2² = 689750981 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (689750981) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 399925 + ... + 401645.

It is an arithmetic number, because the mean of its divisors is an integer number (21573216).

Almost surely, 2^689750985 is an apocalyptic number.

It is an amenable number.

689750985 is an abundant number, since it is smaller than the sum of its proper divisors (690934839).

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

689750985 is a wasteful number, since it uses less digits than its factorization.

689750985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2094.

The product of its (nonzero) digits is 5443200, while the sum is 57.

The square root of 689750985 is about 26263.1107258832. The cubic root of 689750985 is about 883.5492782436.

The spelling of 689750985 in words is "six hundred eighty-nine million, seven hundred fifty thousand, nine hundred eighty-five".