428845861 has 2 divisors, whose sum is σ = 428845862. Its totient is φ = 428845860.

The previous prime is 428845829. The next prime is 428845897. The reversal of 428845861 is 168548824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 235469025 + 193376836 = 15345^2 + 13906^2 .

It is a cyclic number.

It is not a de Polignac number, because 428845861 - 2⁵ = 428845829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428845801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214422930 + 214422931.

It is an arithmetic number, because the mean of its divisors is an integer number (214422931).

Almost surely, 2^428845861 is an apocalyptic number.

It is an amenable number.

428845861 is a deficient number, since it is larger than the sum of its proper divisors (1).

428845861 is an equidigital number, since it uses as much as digits as its factorization.

428845861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 491520, while the sum is 46.

The square root of 428845861 is about 20708.5938923916. The cubic root of 428845861 is about 754.1083349462.

The spelling of 428845861 in words is "four hundred twenty-eight million, eight hundred forty-five thousand, eight hundred sixty-one".