7257490 has 8 divisors (see below), whose sum is σ = 13063500. Its totient is φ = 2902992.

The previous prime is 7257469. The next prime is 7257491. The reversal of 7257490 is 947527.

It can be written as a sum of positive squares in 2 ways, for example, as 6796449 + 461041 = 2607^2 + 679^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×7257490² = 105342322200200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7257491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362865 + ... + 362884.

Almost surely, 2^7257490 is an apocalyptic number.

7257490 is a deficient number, since it is larger than the sum of its proper divisors (5806010).

7257490 is a wasteful number, since it uses less digits than its factorization.

7257490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725756.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 7257490 is about 2693.9729026106. The cubic root of 7257490 is about 193.6104593591.

The spelling of 7257490 in words is "seven million, two hundred fifty-seven thousand, four hundred ninety".