4778987 has 4 divisors (see below), whose sum is σ = 4787640. Its totient is φ = 4770336.

The previous prime is 4778981. The next prime is 4778993. The reversal of 4778987 is 7898774.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (4778981) and next prime (4778993).

It is a cyclic number.

It is not a de Polignac number, because 4778987 - 2⁸ = 4778731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4778981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3437 + ... + 4622.

It is an arithmetic number, because the mean of its divisors is an integer number (1196910).

Almost surely, 2^4778987 is an apocalyptic number.

4778987 is a deficient number, since it is larger than the sum of its proper divisors (8653).

4778987 is an equidigital number, since it uses as much as digits as its factorization.

4778987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8652.

The product of its digits is 790272, while the sum is 50.

The square root of 4778987 is about 2186.0894309245. The cubic root of 4778987 is about 168.4400195077.

The spelling of 4778987 in words is "four million, seven hundred seventy-eight thousand, nine hundred eighty-seven".