7280040 has 128 divisors (see below), whose sum is σ = 23961600. Its totient is φ = 1762560.

The previous prime is 7280033. The next prime is 7280041. The reversal of 7280040 is 400827.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 7279989 and 7280016.

It is not an unprimeable number, because it can be changed into a prime (7280041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70629 + ... + 70731.

It is an arithmetic number, because the mean of its divisors is an integer number (187200).

Almost surely, 2^7280040 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 7280040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11980800).

7280040 is an abundant number, since it is smaller than the sum of its proper divisors (16681560).

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

7280040 is a wasteful number, since it uses less digits than its factorization.

7280040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 7280040 is about 2698.1549251294. The cubic root of 7280040 is about 193.8107766322.

Adding to 7280040 its reverse (400827), we get a palindrome (7680867).

The spelling of 7280040 in words is "seven million, two hundred eighty thousand, forty".