4428781 has 4 divisors (see below), whose sum is σ = 5061472. Its totient is φ = 3796092.

The previous prime is 4428773. The next prime is 4428817. The reversal of 4428781 is 1878244.

4428781 = 304² + 305² + ... + 345².

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 4428781 - 2³ = 4428773 is a prime.

It is a super-2 number, since 2×4428781² = 39228202291922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4428701) 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, 316335 + ... + 316348.

It is an arithmetic number, because the mean of its divisors is an integer number (1265368).

Almost surely, 2^4428781 is an apocalyptic number.

It is an amenable number.

4428781 is a deficient number, since it is larger than the sum of its proper divisors (632691).

4428781 is an equidigital number, since it uses as much as digits as its factorization.

4428781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632690.

The product of its digits is 14336, while the sum is 34.

The square root of 4428781 is about 2104.4669158720. The cubic root of 4428781 is about 164.2207640634.

The spelling of 4428781 in words is "four million, four hundred twenty-eight thousand, seven hundred eighty-one".