7281280 has 64 divisors (see below), whose sum is σ = 18017280. Its totient is φ = 2810880.

The previous prime is 7281277. The next prime is 7281283. The reversal of 7281280 is 821827.

It is an interprime number because it is at equal distance from previous prime (7281277) and next prime (7281283).

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (7281283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19657 + ... + 20023.

It is an arithmetic number, because the mean of its divisors is an integer number (281520).

Almost surely, 2^7281280 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 7281280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9008640).

7281280 is an abundant number, since it is smaller than the sum of its proper divisors (10736000).

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

7281280 is a wasteful number, since it uses less digits than its factorization.

7281280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417 (or 405 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 7281280 is about 2698.3847020023. The cubic root of 7281280 is about 193.8217798556.

The spelling of 7281280 in words is "seven million, two hundred eighty-one thousand, two hundred eighty".