10721280 has 96 divisors (see below), whose sum is σ = 34398000. Its totient is φ = 2850816.

The previous prime is 10721279. The next prime is 10721287. The reversal of 10721280 is 8212701.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×10721280² = 229891689676800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10721287) 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 7 ways as a sum of consecutive naturals, for example, 30546 + ... + 30894.

Almost surely, 2^10721280 is an apocalyptic number.

10721280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 10721280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17199000).

10721280 is an abundant number, since it is smaller than the sum of its proper divisors (23676720).

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

10721280 is an equidigital number, since it uses as much as digits as its factorization.

10721280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379 (or 359 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 10721280 is about 3274.3365740253. The cubic root of 10721280 is about 220.5035298513.

Adding to 10721280 its reverse (8212701), we get a palindrome (18933981).

The spelling of 10721280 in words is "ten million, seven hundred twenty-one thousand, two hundred eighty".