428634089 has 4 divisors (see below), whose sum is σ = 461605956. Its totient is φ = 395662224.

The previous prime is 428634079. The next prime is 428634103. The reversal of 428634089 is 980436824.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 196224064 + 232410025 = 14008^2 + 15245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428634089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428634079) 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 3 ways as a sum of consecutive naturals, for example, 16485914 + ... + 16485939.

It is an arithmetic number, because the mean of its divisors is an integer number (115401489).

Almost surely, 2^428634089 is an apocalyptic number.

It is an amenable number.

428634089 is a deficient number, since it is larger than the sum of its proper divisors (32971867).

428634089 is a wasteful number, since it uses less digits than its factorization.

428634089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32971866.

The product of its (nonzero) digits is 331776, while the sum is 44.

The square root of 428634089 is about 20703.4801180864. The cubic root of 428634089 is about 753.9841836373.

The spelling of 428634089 in words is "four hundred twenty-eight million, six hundred thirty-four thousand, eighty-nine".