1638057796 has 12 divisors (see below), whose sum is σ = 2867514748. Its totient is φ = 818767872.

The previous prime is 1638057767. The next prime is 1638057833. The reversal of 1638057796 is 6977508361.

It can be written as a sum of positive squares in 2 ways, for example, as 1456185600 + 181872196 = 38160^2 + 13486^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 50781 + ... + 76516.

Almost surely, 2^1638057796 is an apocalyptic number.

It is an amenable number.

1638057796 is a deficient number, since it is larger than the sum of its proper divisors (1229456952).

1638057796 is a wasteful number, since it uses less digits than its factorization.

1638057796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130518 (or 130516 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 52.

The square root of 1638057796 is about 40472.9267041562. The cubic root of 1638057796 is about 1178.8079976576.

The spelling of 1638057796 in words is "one billion, six hundred thirty-eight million, fifty-seven thousand, seven hundred ninety-six".