428978609 has 2 divisors, whose sum is σ = 428978610. Its totient is φ = 428978608.

The previous prime is 428978579. The next prime is 428978639. The reversal of 428978609 is 906879824.

It is a balanced prime because it is at equal distance from previous prime (428978579) and next prime (428978639).

It can be written as a sum of positive squares in only one way, i.e., 422713600 + 6265009 = 20560^2 + 2503^2 .

It is a cyclic number.

It is not a de Polignac number, because 428978609 - 2²⁴ = 412201393 is a prime.

It is not a weakly prime, because it can be changed into another prime (428978639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214489304 + 214489305.

It is an arithmetic number, because the mean of its divisors is an integer number (214489305).

Almost surely, 2^428978609 is an apocalyptic number.

It is an amenable number.

428978609 is a deficient number, since it is larger than the sum of its proper divisors (1).

428978609 is an equidigital number, since it uses as much as digits as its factorization.

428978609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The square root of 428978609 is about 20711.7987871648. The cubic root of 428978609 is about 754.1861376060.

The spelling of 428978609 in words is "four hundred twenty-eight million, nine hundred seventy-eight thousand, six hundred nine".