4028778 has 40 divisors (see below), whose sum is σ = 9726948. Its totient is φ = 1238976.

The previous prime is 4028771. The next prime is 4028807. The reversal of 4028778 is 8778204.

It can be written as a sum of positive squares in 2 ways, for example, as 4028049 + 729 = 2007^2 + 27^2 .

It is not an unprimeable number, because it can be changed into a prime (4028771) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1150 + ... + 3062.

Almost surely, 2^4028778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4028778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4863474).

4028778 is an abundant number, since it is smaller than the sum of its proper divisors (5698170).

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

4028778 is a wasteful number, since it uses less digits than its factorization.

4028778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940 (or 1931 counting only the distinct ones).

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

The square root of 4028778 is about 2007.1816061333. The cubic root of 4028778 is about 159.1198811107.

It can be divided in two parts, 402 and 8778, that added together give a triangular number (9180 = T₁₃₅).

The spelling of 4028778 in words is "four million, twenty-eight thousand, seven hundred seventy-eight".