428779849 has 3 divisors (see below), whose sum is σ = 428800557. Its totient is φ = 428759142.

The previous prime is 428779843. The next prime is 428779861. The reversal of 428779849 is 948977824.

The square root of 428779849 is 20707.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 428779849 - 2¹⁷ = 428648777 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 428779793 and 428779802.

It is not an unprimeable number, because it can be changed into a prime (428779843) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 10354 + ... + 31060.

It is an arithmetic number, because the mean of its divisors is an integer number (142933519).

Almost surely, 2^428779849 is an apocalyptic number.

428779849 is the 20707-th square number.

428779849 is the 10354-th centered octagonal number.

It is an amenable number.

428779849 is a deficient number, since it is larger than the sum of its proper divisors (20708).

428779849 is an frugal number, since it uses more digits than its factorization.

428779849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41414 (or 20707 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 58.

The cubic root of 428779849 is about 754.0696398047.

The spelling of 428779849 in words is "four hundred twenty-eight million, seven hundred seventy-nine thousand, eight hundred forty-nine".