4778861 has 4 divisors (see below), whose sum is σ = 5030400. Its totient is φ = 4527324.

The previous prime is 4778843. The next prime is 4778863. The reversal of 4778861 is 1688774.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4778861 - 2¹⁴ = 4762477 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 (4778863) 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, 125741 + ... + 125778.

It is an arithmetic number, because the mean of its divisors is an integer number (1257600).

Almost surely, 2^4778861 is an apocalyptic number.

It is an amenable number.

4778861 is a deficient number, since it is larger than the sum of its proper divisors (251539).

4778861 is a wasteful number, since it uses less digits than its factorization.

4778861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251538.

The product of its digits is 75264, while the sum is 41.

The square root of 4778861 is about 2186.0606121515. The cubic root of 4778861 is about 168.4385391640.

The spelling of 4778861 in words is "four million, seven hundred seventy-eight thousand, eight hundred sixty-one".