7878731 has 16 divisors (see below), whose sum is σ = 9282816. Its totient is φ = 6548256.

The previous prime is 7878721. The next prime is 7878763. The reversal of 7878731 is 1378787.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7878731 is a prime.

It is a super-2 number, since 2×7878731² = 124148804340722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7878721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50105 + ... + 50261.

It is an arithmetic number, because the mean of its divisors is an integer number (580176).

Almost surely, 2^7878731 is an apocalyptic number.

7878731 is a deficient number, since it is larger than the sum of its proper divisors (1404085).

7878731 is a wasteful number, since it uses less digits than its factorization.

7878731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338.

The product of its digits is 65856, while the sum is 41.

The square root of 7878731 is about 2806.9077291568. The cubic root of 7878731 is about 198.9842752488.

The spelling of 7878731 in words is "seven million, eight hundred seventy-eight thousand, seven hundred thirty-one".