428161639 has 2 divisors, whose sum is σ = 428161640. Its totient is φ = 428161638.

The previous prime is 428161619. The next prime is 428161663. The reversal of 428161639 is 936161824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 428161639 - 2¹¹ = 428159591 is a prime.

It is a super-2 number, since 2×428161639² = 366644778222332642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428161619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214080819 + 214080820.

It is an arithmetic number, because the mean of its divisors is an integer number (214080820).

Almost surely, 2^428161639 is an apocalyptic number.

428161639 is a deficient number, since it is larger than the sum of its proper divisors (1).

428161639 is an equidigital number, since it uses as much as digits as its factorization.

428161639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 40.

The square root of 428161639 is about 20692.0670547918. The cubic root of 428161639 is about 753.7070624324.

The spelling of 428161639 in words is "four hundred twenty-eight million, one hundred sixty-one thousand, six hundred thirty-nine".