1368910640 has 20 divisors (see below), whose sum is σ = 3182717424. Its totient is φ = 547564224.

The previous prime is 1368910597. The next prime is 1368910643. The reversal of 1368910640 is 460198631.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1368910594 and 1368910603.

It is not an unprimeable number, because it can be changed into a prime (1368910643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8555612 + ... + 8555771.

Almost surely, 2^1368910640 is an apocalyptic number.

1368910640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1368910640 is an abundant number, since it is smaller than the sum of its proper divisors (1813806784).

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

1368910640 is a wasteful number, since it uses less digits than its factorization.

1368910640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17111396 (or 17111390 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 1368910640 is about 36998.7924127261. The cubic root of 1368910640 is about 1110.3460869258.

The spelling of 1368910640 in words is "one billion, three hundred sixty-eight million, nine hundred ten thousand, six hundred forty".