1638677028 has 24 divisors (see below), whose sum is σ = 3833841088. Its totient is φ = 544759776.

The previous prime is 1638677023. The next prime is 1638677077. The reversal of 1638677028 is 8207768361.

It is not an unprimeable number, because it can be changed into a prime (1638677023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178576 + ... + 187527.

Almost surely, 2^1638677028 is an apocalyptic number.

It is an amenable number.

1638677028 is an abundant number, since it is smaller than the sum of its proper divisors (2195164060).

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

1638677028 is a wasteful number, since it uses less digits than its factorization.

1638677028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366483 (or 366481 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 48.

The square root of 1638677028 is about 40480.5759346381. The cubic root of 1638677028 is about 1178.9565198229.

The spelling of 1638677028 in words is "one billion, six hundred thirty-eight million, six hundred seventy-seven thousand, twenty-eight".