1635052638 has 64 divisors (see below), whose sum is σ = 3528852480. Its totient is φ = 503424000.

The previous prime is 1635052633. The next prime is 1635052649. The reversal of 1635052638 is 8362505361.

It is a junction number, because it is equal to n+sod(n) for n = 1635052596 and 1635052605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1635052633) 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 31 ways as a sum of consecutive naturals, for example, 2148178 + ... + 2148938.

It is an arithmetic number, because the mean of its divisors is an integer number (55138320).

Almost surely, 2^1635052638 is an apocalyptic number.

1635052638 is an abundant number, since it is smaller than the sum of its proper divisors (1893799842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1635052638 is a wasteful number, since it uses less digits than its factorization.

1635052638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 1635052638 is about 40435.7841274285. The cubic root of 1635052638 is about 1178.0866814649.

Adding to 1635052638 its reverse (8362505361), we get a palindrome (9997557999).

The spelling of 1635052638 in words is "one billion, six hundred thirty-five million, fifty-two thousand, six hundred thirty-eight".