428521967 has 2 divisors, whose sum is σ = 428521968. Its totient is φ = 428521966.

The previous prime is 428521963. The next prime is 428521987. The reversal of 428521967 is 769125824.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 428521967 - 2² = 428521963 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 (428521963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214260983 + 214260984.

It is an arithmetic number, because the mean of its divisors is an integer number (214260984).

Almost surely, 2^428521967 is an apocalyptic number.

428521967 is a deficient number, since it is larger than the sum of its proper divisors (1).

428521967 is an equidigital number, since it uses as much as digits as its factorization.

428521967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 428521967 is about 20700.7721353577. The cubic root of 428521967 is about 753.9184355714.

The spelling of 428521967 in words is "four hundred twenty-eight million, five hundred twenty-one thousand, nine hundred sixty-seven".