428081289 has 4 divisors (see below), whose sum is σ = 570775056. Its totient is φ = 285387524.

The previous prime is 428081257. The next prime is 428081351. The reversal of 428081289 is 982180824.

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 428081289 - 2⁵ = 428081257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 428081289.

It is not an unprimeable number, because it can be changed into a prime (428081239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71346879 + ... + 71346884.

It is an arithmetic number, because the mean of its divisors is an integer number (142693764).

Almost surely, 2^428081289 is an apocalyptic number.

It is an amenable number.

428081289 is a deficient number, since it is larger than the sum of its proper divisors (142693767).

428081289 is a wasteful number, since it uses less digits than its factorization.

428081289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142693766.

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 428081289 is about 20690.1253983633. The cubic root of 428081289 is about 753.6599118973.

The spelling of 428081289 in words is "four hundred twenty-eight million, eighty-one thousand, two hundred eighty-nine".