10989520 has 20 divisors (see below), whose sum is σ = 25550820. Its totient is φ = 4395776.

The previous prime is 10989509. The next prime is 10989523. The reversal of 10989520 is 2598901.

It can be written as a sum of positive squares in 2 ways, for example, as 3283344 + 7706176 = 1812^2 + 2776^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10989523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68605 + ... + 68764.

It is an arithmetic number, because the mean of its divisors is an integer number (1277541).

Almost surely, 2^10989520 is an apocalyptic number.

10989520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10989520 is an abundant number, since it is smaller than the sum of its proper divisors (14561300).

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

10989520 is a wasteful number, since it uses less digits than its factorization.

10989520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137382 (or 137376 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 10989520 is about 3315.0444944224. The cubic root of 10989520 is about 222.3273583990.

The spelling of 10989520 in words is "ten million, nine hundred eighty-nine thousand, five hundred twenty".