1268636648 has 8 divisors (see below), whose sum is σ = 2378693730. Its totient is φ = 634318320.

The previous prime is 1268636647. The next prime is 1268636689. The reversal of 1268636648 is 8466368621.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1002228964 + 266407684 = 31658^2 + 16322^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 1268636596 and 1268636605.

It is not an unprimeable number, because it can be changed into a prime (1268636647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79289783 + ... + 79289798.

Almost surely, 2^1268636648 is an apocalyptic number.

It is an amenable number.

1268636648 is a deficient number, since it is larger than the sum of its proper divisors (1110057082).

1268636648 is a wasteful number, since it uses less digits than its factorization.

1268636648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158579587 (or 158579583 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 50.

The square root of 1268636648 is about 35617.9259362473. The cubic root of 1268636648 is about 1082.5444828796.

The spelling of 1268636648 in words is "one billion, two hundred sixty-eight million, six hundred thirty-six thousand, six hundred forty-eight".