7828731 has 14 divisors (see below), whose sum is σ = 11738820. Its totient is φ = 5218668.

The previous prime is 7828729. The next prime is 7828747. The reversal of 7828731 is 1378287.

It is not a de Polignac number, because 7828731 - 2¹ = 7828729 is a prime.

It is a super-2 number, since 2×7828731² = 122578058140722, which contains 22 as substring.

7828731 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7828781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 4641 + ... + 6098.

Almost surely, 2^7828731 is an apocalyptic number.

7828731 is a deficient number, since it is larger than the sum of its proper divisors (3910089).

7828731 is an equidigital number, since it uses as much as digits as its factorization.

7828731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10757 (or 10742 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 7828731 is about 2797.9869549374. The cubic root of 7828731 is about 198.5624503447.

The spelling of 7828731 in words is "seven million, eight hundred twenty-eight thousand, seven hundred thirty-one".