689949280 has 96 divisors (see below), whose sum is σ = 1739858400. Its totient is φ = 257789952.

The previous prime is 689949269. The next prime is 689949313. The reversal of 689949280 is 82949986.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220366 + ... + 223474.

It is an arithmetic number, because the mean of its divisors is an integer number (18123525).

Almost surely, 2^689949280 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 689949280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (869929200).

689949280 is an abundant number, since it is smaller than the sum of its proper divisors (1049909120).

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

689949280 is a wasteful number, since it uses less digits than its factorization.

689949280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3216 (or 3208 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 55.

The square root of 689949280 is about 26266.8856166847. The cubic root of 689949280 is about 883.6339400134.

The spelling of 689949280 in words is "six hundred eighty-nine million, nine hundred forty-nine thousand, two hundred eighty".