428842637 has 4 divisors (see below), whose sum is σ = 428903676. Its totient is φ = 428781600.

The previous prime is 428842619. The next prime is 428842681. The reversal of 428842637 is 736248824.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 393070276 + 35772361 = 19826^2 + 5981^2 .

It is a cyclic number.

It is not a de Polignac number, because 428842637 - 2¹² = 428838541 is a prime.

It is a super-2 number, since 2×428842637² = 367812014618227538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428842237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18368 + ... + 34569.

It is an arithmetic number, because the mean of its divisors is an integer number (107225919).

Almost surely, 2^428842637 is an apocalyptic number.

It is an amenable number.

428842637 is a deficient number, since it is larger than the sum of its proper divisors (61039).

428842637 is an equidigital number, since it uses as much as digits as its factorization.

428842637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61038.

The product of its digits is 516096, while the sum is 44.

The square root of 428842637 is about 20708.5160501664. The cubic root of 428842637 is about 754.1064451830.

The spelling of 428842637 in words is "four hundred twenty-eight million, eight hundred forty-two thousand, six hundred thirty-seven".