4778991 has 24 divisors (see below), whose sum is σ = 8146944. Its totient is φ = 2641680.

The previous prime is 4778981. The next prime is 4778993. The reversal of 4778991 is 1998774.

It is not a de Polignac number, because 4778991 - 2⁶ = 4778927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4778993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 730 + ... + 3176.

It is an arithmetic number, because the mean of its divisors is an integer number (339456).

Almost surely, 2^4778991 is an apocalyptic number.

4778991 is a deficient number, since it is larger than the sum of its proper divisors (3367953).

4778991 is a wasteful number, since it uses less digits than its factorization.

4778991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2491 (or 2488 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 4778991 is about 2186.0903458000. The cubic root of 4778991 is about 168.4400665023.

The spelling of 4778991 in words is "four million, seven hundred seventy-eight thousand, nine hundred ninety-one".