7128420 has 144 divisors (see below), whose sum is σ = 23365440. Its totient is φ = 1617408.

The previous prime is 7128391. The next prime is 7128427. The reversal of 7128420 is 248217.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7128427) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 192642 + ... + 192678.

It is an arithmetic number, because the mean of its divisors is an integer number (162260).

Almost surely, 2^7128420 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 7128420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11682720).

7128420 is an abundant number, since it is smaller than the sum of its proper divisors (16237020).

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

7128420 is a wasteful number, since it uses less digits than its factorization.

7128420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94 (or 79 counting only the distinct ones).

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

The square root of 7128420 is about 2669.9101108464. The cubic root of 7128420 is about 192.4558396481.

The spelling of 7128420 in words is "seven million, one hundred twenty-eight thousand, four hundred twenty".