7878487 has 2 divisors, whose sum is σ = 7878488. Its totient is φ = 7878486.

The previous prime is 7878461. The next prime is 7878491. The reversal of 7878487 is 7848787.

It is a strong prime.

It is an emirp because it is prime and its reverse (7848787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7878487 - 2⁷ = 7878359 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 7878487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7878427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3939243 + 3939244.

It is an arithmetic number, because the mean of its divisors is an integer number (3939244).

Almost surely, 2^7878487 is an apocalyptic number.

7878487 is a deficient number, since it is larger than the sum of its proper divisors (1).

7878487 is an equidigital number, since it uses as much as digits as its factorization.

7878487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 702464, while the sum is 49.

The square root of 7878487 is about 2806.8642646199. The cubic root of 7878487 is about 198.9822210828.

The spelling of 7878487 in words is "seven million, eight hundred seventy-eight thousand, four hundred eighty-seven".