1671638228 has 36 divisors (see below), whose sum is σ = 3191102460. Its totient is φ = 761587200.

The previous prime is 1671638197. The next prime is 1671638231. The reversal of 1671638228 is 8228361761.

It can be written as a sum of positive squares in 6 ways, for example, as 300304 + 1671337924 = 548^2 + 40882^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2781128 + ... + 2781728.

It is an arithmetic number, because the mean of its divisors is an integer number (88641735).

Almost surely, 2^1671638228 is an apocalyptic number.

It is an amenable number.

1671638228 is a deficient number, since it is larger than the sum of its proper divisors (1519464232).

1671638228 is an equidigital number, since it uses as much as digits as its factorization.

1671638228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308 (or 705 counting only the distinct ones).

The product of its digits is 193536, while the sum is 44.

The square root of 1671638228 is about 40885.6726494747. The cubic root of 1671638228 is about 1186.8088188010.

Adding to 1671638228 its reverse (8228361761), we get a palindrome (9899999989).

The spelling of 1671638228 in words is "one billion, six hundred seventy-one million, six hundred thirty-eight thousand, two hundred twenty-eight".