428333725 has 6 divisors (see below), whose sum is σ = 531133850. Its totient is φ = 342666960.

The previous prime is 428333723. The next prime is 428333729. The reversal of 428333725 is 527333824.

It can be written as a sum of positive squares in 3 ways, for example, as 26491609 + 401842116 = 5147^2 + 20046^2 .

It is not a de Polignac number, because 428333725 - 2¹ = 428333723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428333723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8566650 + ... + 8566699.

Almost surely, 2^428333725 is an apocalyptic number.

It is an amenable number.

428333725 is a deficient number, since it is larger than the sum of its proper divisors (102800125).

428333725 is a wasteful number, since it uses less digits than its factorization.

428333725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17133359 (or 17133354 counting only the distinct ones).

The product of its digits is 120960, while the sum is 37.

The square root of 428333725 is about 20696.2248973092. The cubic root of 428333725 is about 753.8080251289.

Subtracting 428333725 from its reverse (527333824), we obtain a palindrome (99000099).

It can be divided in two parts, 428 and 333725, that added together give a triangular number (334153 = T₈₁₇).

The spelling of 428333725 in words is "four hundred twenty-eight million, three hundred thirty-three thousand, seven hundred twenty-five".