7128240 has 80 divisors (see below), whose sum is σ = 25260288. Its totient is φ = 1628928.

The previous prime is 7128227. The next prime is 7128259. The reversal of 7128240 is 428217.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 7128240.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 442 + ... + 3801.

Almost surely, 2^7128240 is an apocalyptic number.

7128240 is a gapful number since it is divisible by the number (70) 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 7128240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12630144).

7128240 is an abundant number, since it is smaller than the sum of its proper divisors (18132048).

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

7128240 is a wasteful number, since it uses less digits than its factorization.

7128240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4266 (or 4260 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 7128240 is about 2669.8764016336. The cubic root of 7128240 is about 192.4542197313.

The spelling of 7128240 in words is "seven million, one hundred twenty-eight thousand, two hundred forty".