7280840 has 32 divisors (see below), whose sum is σ = 18722880. Its totient is φ = 2496192.

The previous prime is 7280831. The next prime is 7280863. The reversal of 7280840 is 480827.

It is a super-2 number, since 2×7280840² = 106021262211200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12722 + ... + 13281.

It is an arithmetic number, because the mean of its divisors is an integer number (585090).

Almost surely, 2^7280840 is an apocalyptic number.

7280840 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

7280840 is an abundant number, since it is smaller than the sum of its proper divisors (11442040).

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

7280840 is a wasteful number, since it uses less digits than its factorization.

7280840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26021 (or 26017 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 7280840 is about 2698.3031705129. The cubic root of 7280840 is about 193.8178756290.

The spelling of 7280840 in words is "seven million, two hundred eighty thousand, eight hundred forty".