69489920 has 54 divisors (see below), whose sum is σ = 167167518. Its totient is φ = 27676672.

The previous prime is 69489899. The next prime is 69489929. The reversal of 69489920 is 2998496.

It can be written as a sum of positive squares in 3 ways, for example, as 1024 + 69488896 = 32^2 + 8336^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69489929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 298124 + ... + 298356.

Almost surely, 2^69489920 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 69489920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83583759).

69489920 is an abundant number, since it is smaller than the sum of its proper divisors (97677598).

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

69489920 is an frugal number, since it uses more digits than its factorization.

69489920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487 (or 240 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 69489920 is about 8336.0614201192. The cubic root of 69489920 is about 411.1250480355.

The spelling of 69489920 in words is "sixty-nine million, four hundred eighty-nine thousand, nine hundred twenty".