7255840 has 48 divisors (see below), whose sum is σ = 17350200. Its totient is φ = 2867200.

The previous prime is 7255817. The next prime is 7255841. The reversal of 7255840 is 485527.

It can be written as a sum of positive squares in 4 ways, for example, as 7160976 + 94864 = 2676^2 + 308^2 .

It is not an unprimeable number, because it can be changed into a prime (7255841) 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, 15936 + ... + 16384.

Almost surely, 2^7255840 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 7255840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8675100).

7255840 is an abundant number, since it is smaller than the sum of its proper divisors (10094360).

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

7255840 is a wasteful number, since it uses less digits than its factorization.

7255840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565 (or 557 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 7255840 is about 2693.6666460422. Note that the first 4 decimals coincide. The cubic root of 7255840 is about 193.5957857152.

The spelling of 7255840 in words is "seven million, two hundred fifty-five thousand, eight hundred forty".