7128345 has 32 divisors (see below), whose sum is σ = 13489920. Its totient is φ = 3144960.

The previous prime is 7128307. The next prime is 7128347. The reversal of 7128345 is 5438217.

It is not a de Polignac number, because 7128345 - 2⁶ = 7128281 is a prime.

7128345 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7128347) 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 31 ways as a sum of consecutive naturals, for example, 1875 + ... + 4215.

It is an arithmetic number, because the mean of its divisors is an integer number (421560).

Almost surely, 2^7128345 is an apocalyptic number.

It is an amenable number.

7128345 is a deficient number, since it is larger than the sum of its proper divisors (6361575).

7128345 is a wasteful number, since it uses less digits than its factorization.

7128345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2385.

The product of its digits is 6720, while the sum is 30.

The square root of 7128345 is about 2669.8960653928. The cubic root of 7128345 is about 192.4551646861.

The spelling of 7128345 in words is "seven million, one hundred twenty-eight thousand, three hundred forty-five".