428820849 has 6 divisors (see below), whose sum is σ = 619407906. Its totient is φ = 285880560.

The previous prime is 428820841. The next prime is 428820853. The reversal of 428820849 is 948028824.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 407030625 + 21790224 = 20175^2 + 4668^2 .

It is not a de Polignac number, because 428820849 - 2³ = 428820841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (428820841) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23823372 + ... + 23823389.

It is an arithmetic number, because the mean of its divisors is an integer number (103234651).

Almost surely, 2^428820849 is an apocalyptic number.

It is an amenable number.

428820849 is a deficient number, since it is larger than the sum of its proper divisors (190587057).

428820849 is a wasteful number, since it uses less digits than its factorization.

428820849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47646767 (or 47646764 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 45.

The square root of 428820849 is about 20707.9899797156. The cubic root of 428820849 is about 754.0936737932.

The spelling of 428820849 in words is "four hundred twenty-eight million, eight hundred twenty thousand, eight hundred forty-nine".