1638768064 has 14 divisors (see below), whose sum is σ = 3251930504. Its totient is φ = 819384000.

The previous prime is 1638768049. The next prime is 1638768083. The reversal of 1638768064 is 4608678361.

It is a junction number, because it is equal to n+sod(n) for n = 1638767999 and 1638768017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12802812 + ... + 12802939.

Almost surely, 2^1638768064 is an apocalyptic number.

It is an amenable number.

1638768064 is a deficient number, since it is larger than the sum of its proper divisors (1613162440).

1638768064 is an equidigital number, since it uses as much as digits as its factorization.

1638768064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25605763 (or 25605753 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 49.

The square root of 1638768064 is about 40481.7003595452. The cubic root of 1638768064 is about 1178.9783515600.

The spelling of 1638768064 in words is "one billion, six hundred thirty-eight million, seven hundred sixty-eight thousand, sixty-four".