7878287 has 4 divisors (see below), whose sum is σ = 7912920. Its totient is φ = 7843656.

The previous prime is 7878271. The next prime is 7878289. The reversal of 7878287 is 7828787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7828787 = 523 ⋅14969.

It is a cyclic number.

It is not a de Polignac number, because 7878287 - 2⁴ = 7878271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7878289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16973 + ... + 17430.

It is an arithmetic number, because the mean of its divisors is an integer number (1978230).

Almost surely, 2^7878287 is an apocalyptic number.

7878287 is a deficient number, since it is larger than the sum of its proper divisors (34633).

7878287 is a wasteful number, since it uses less digits than its factorization.

7878287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34632.

The product of its digits is 351232, while the sum is 47.

The square root of 7878287 is about 2806.8286374483. The cubic root of 7878287 is about 198.9805373085.

The spelling of 7878287 in words is "seven million, eight hundred seventy-eight thousand, two hundred eighty-seven".