428280623 has 2 divisors, whose sum is σ = 428280624. Its totient is φ = 428280622.

The previous prime is 428280599. The next prime is 428280649. The reversal of 428280623 is 326082824.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428280623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428286623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214140311 + 214140312.

It is an arithmetic number, because the mean of its divisors is an integer number (214140312).

Almost surely, 2^428280623 is an apocalyptic number.

428280623 is a deficient number, since it is larger than the sum of its proper divisors (1).

428280623 is an equidigital number, since it uses as much as digits as its factorization.

428280623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 35.

The square root of 428280623 is about 20694.9419665772. The cubic root of 428280623 is about 753.7768731200.

The spelling of 428280623 in words is "four hundred twenty-eight million, two hundred eighty thousand, six hundred twenty-three".