7128457 has 16 divisors (see below), whose sum is σ = 8864640. Its totient is φ = 5591808.

The previous prime is 7128437. The next prime is 7128463. The reversal of 7128457 is 7548217.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 7128457 - 2¹⁵ = 7095689 is a prime.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 3594 + ... + 5212.

It is an arithmetic number, because the mean of its divisors is an integer number (554040).

Almost surely, 2^7128457 is an apocalyptic number.

It is an amenable number.

7128457 is a deficient number, since it is larger than the sum of its proper divisors (1736183).

7128457 is a wasteful number, since it uses less digits than its factorization.

7128457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680.

The product of its digits is 15680, while the sum is 34.

The square root of 7128457 is about 2669.9170399097. The cubic root of 7128457 is about 192.4561726276.

The spelling of 7128457 in words is "seven million, one hundred twenty-eight thousand, four hundred fifty-seven".