7257428 has 6 divisors (see below), whose sum is σ = 12700506. Its totient is φ = 3628712.

The previous prime is 7257421. The next prime is 7257431. The reversal of 7257428 is 8247527.

It can be written as a sum of positive squares in only one way, i.e., 6461764 + 795664 = 2542^2 + 892^2 .

It is a super-2 number, since 2×7257428² = 105340522350368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7257421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 907175 + ... + 907182.

It is an arithmetic number, because the mean of its divisors is an integer number (2116751).

Almost surely, 2^7257428 is an apocalyptic number.

It is an amenable number.

7257428 is a deficient number, since it is larger than the sum of its proper divisors (5443078).

7257428 is a wasteful number, since it uses less digits than its factorization.

7257428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1814361 (or 1814359 counting only the distinct ones).

The product of its digits is 31360, while the sum is 35.

The square root of 7257428 is about 2693.9613954175. The cubic root of 7257428 is about 193.6099080260.

Subtracting 7257428 from its reverse (8247527), we obtain a palindrome (990099).

The spelling of 7257428 in words is "seven million, two hundred fifty-seven thousand, four hundred twenty-eight".