7828281 has 6 divisors (see below), whose sum is σ = 11307530. Its totient is φ = 5218848.

The previous prime is 7828277. The next prime is 7828283. The reversal of 7828281 is 1828287.

It can be written as a sum of positive squares in only one way, i.e., 7617600 + 210681 = 2760^2 + 459^2 .

It is not a de Polignac number, because 7828281 - 2² = 7828277 is a prime.

It is a super-2 number, since 2×7828281² = 122563966829922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7828283) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 434896 + ... + 434913.

Almost surely, 2^7828281 is an apocalyptic number.

It is an amenable number.

7828281 is a deficient number, since it is larger than the sum of its proper divisors (3479249).

7828281 is a wasteful number, since it uses less digits than its factorization.

7828281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869815 (or 869812 counting only the distinct ones).

The product of its digits is 14336, while the sum is 36.

The square root of 7828281 is about 2797.9065388251. The cubic root of 7828281 is about 198.5586457768.

The spelling of 7828281 in words is "seven million, eight hundred twenty-eight thousand, two hundred eighty-one".