1863665768 has 32 divisors (see below), whose sum is σ = 3682324800. Its totient is φ = 881820288.

The previous prime is 1863665767. The next prime is 1863665789. The reversal of 1863665768 is 8675663681.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1863665767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143180 + ... + 155652.

It is an arithmetic number, because the mean of its divisors is an integer number (115072650).

Almost surely, 2^1863665768 is an apocalyptic number.

It is an amenable number.

1863665768 is a deficient number, since it is larger than the sum of its proper divisors (1818659032).

1863665768 is a wasteful number, since it uses less digits than its factorization.

1863665768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13481 (or 13477 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 56.

The square root of 1863665768 is about 43170.1953667110. The cubic root of 1863665768 is about 1230.6163364055.

The spelling of 1863665768 in words is "one billion, eight hundred sixty-three million, six hundred sixty-five thousand, seven hundred sixty-eight".