1638622104 has 64 divisors (see below), whose sum is σ = 4761158400. Its totient is φ = 460239744.

The previous prime is 1638622103. The next prime is 1638622121. The reversal of 1638622104 is 4012268361.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638622103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72747 + ... + 92570.

It is an arithmetic number, because the mean of its divisors is an integer number (74393100).

Almost surely, 2^1638622104 is an apocalyptic number.

1638622104 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1638622104 is an abundant number, since it is smaller than the sum of its proper divisors (3122536296).

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

1638622104 is a wasteful number, since it uses less digits than its factorization.

1638622104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165392 (or 165388 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 1638622104 is about 40479.8975295146. The cubic root of 1638622104 is about 1178.9433478697.

The spelling of 1638622104 in words is "one billion, six hundred thirty-eight million, six hundred twenty-two thousand, one hundred four".