7257128 has 8 divisors (see below), whose sum is σ = 13607130. Its totient is φ = 3628560.

The previous prime is 7257127. The next prime is 7257137. The reversal of 7257128 is 8217527.

It can be written as a sum of positive squares in only one way, i.e., 5189284 + 2067844 = 2278^2 + 1438^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 7257094 and 7257103.

It is not an unprimeable number, because it can be changed into a prime (7257127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 453563 + ... + 453578.

Almost surely, 2^7257128 is an apocalyptic number.

It is an amenable number.

7257128 is a deficient number, since it is larger than the sum of its proper divisors (6350002).

7257128 is a wasteful number, since it uses less digits than its factorization.

7257128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907147 (or 907143 counting only the distinct ones).

The product of its digits is 7840, while the sum is 32.

The square root of 7257128 is about 2693.9057147569. The cubic root of 7257128 is about 193.6072402410.

The spelling of 7257128 in words is "seven million, two hundred fifty-seven thousand, one hundred twenty-eight".