1636320428 has 6 divisors (see below), whose sum is σ = 2863560756. Its totient is φ = 818160212.

The previous prime is 1636320421. The next prime is 1636320437. The reversal of 1636320428 is 8240236361.

It is not an unprimeable number, because it can be changed into a prime (1636320421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204540050 + ... + 204540057.

It is an arithmetic number, because the mean of its divisors is an integer number (477260126).

Almost surely, 2^1636320428 is an apocalyptic number.

It is an amenable number.

1636320428 is a deficient number, since it is larger than the sum of its proper divisors (1227240328).

1636320428 is a wasteful number, since it uses less digits than its factorization.

1636320428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409080111 (or 409080109 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 1636320428 is about 40451.4576746006. The cubic root of 1636320428 is about 1178.3910917772.

Adding to 1636320428 its reverse (8240236361), we get a palindrome (9876556789).

The spelling of 1636320428 in words is "one billion, six hundred thirty-six million, three hundred twenty thousand, four hundred twenty-eight".