7256605 has 4 divisors (see below), whose sum is σ = 8707932. Its totient is φ = 5805280.

The previous prime is 7256593. The next prime is 7256609. The reversal of 7256605 is 5066527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5066527 = 17 ⋅298031.

It can be written as a sum of positive squares in 2 ways, for example, as 2442969 + 4813636 = 1563^2 + 2194^2 .

It is not a de Polignac number, because 7256605 - 2¹¹ = 7254557 is a prime.

It is a super-2 number, since 2×7256605² = 105316632252050, which contains 22 as substring.

It is a Duffinian number.

7256605 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7256609) 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, 725656 + ... + 725665.

It is an arithmetic number, because the mean of its divisors is an integer number (2176983).

Almost surely, 2^7256605 is an apocalyptic number.

It is an amenable number.

7256605 is a deficient number, since it is larger than the sum of its proper divisors (1451327).

7256605 is a wasteful number, since it uses less digits than its factorization.

7256605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451326.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 7256605 is about 2693.8086420531. The cubic root of 7256605 is about 193.6025892267.

The spelling of 7256605 in words is "seven million, two hundred fifty-six thousand, six hundred five".