4778820 has 72 divisors (see below), whose sum is σ = 14676480. Its totient is φ = 1258560.

The previous prime is 4778803. The next prime is 4778827. The reversal of 4778820 is 288774.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4778827) 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, 24925 + ... + 25115.

It is an arithmetic number, because the mean of its divisors is an integer number (203840).

Almost surely, 2^4778820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4778820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7338240).

4778820 is an abundant number, since it is smaller than the sum of its proper divisors (9897660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4778820 is a wasteful number, since it uses less digits than its factorization.

4778820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 4778820 is about 2186.0512345323. The cubic root of 4778820 is about 168.4380574593.

The spelling of 4778820 in words is "four million, seven hundred seventy-eight thousand, eight hundred twenty".