428000621 has 2 divisors, whose sum is σ = 428000622. Its totient is φ = 428000620.

The previous prime is 428000609. The next prime is 428000627. The reversal of 428000621 is 126000824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 411075625 + 16924996 = 20275^2 + 4114^2 .

It is a cyclic number.

It is not a de Polignac number, because 428000621 - 2¹⁸ = 427738477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428000627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214000310 + 214000311.

It is an arithmetic number, because the mean of its divisors is an integer number (214000311).

Almost surely, 2^428000621 is an apocalyptic number.

It is an amenable number.

428000621 is a deficient number, since it is larger than the sum of its proper divisors (1).

428000621 is an equidigital number, since it uses as much as digits as its factorization.

428000621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 428000621 is about 20688.1758741557. The cubic root of 428000621 is about 753.6125688197.

The spelling of 428000621 in words is "four hundred twenty-eight million, six hundred twenty-one", and thus it is an aban number.