1868828643 has 24 divisors (see below), whose sum is σ = 3046371120. Its totient is φ = 1093565760.

The previous prime is 1868828641. The next prime is 1868828659. The reversal of 1868828643 is 3468288681.

It is not a de Polignac number, because 1868828643 - 2¹ = 1868828641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1868828643.

It is not an unprimeable number, because it can be changed into a prime (1868828641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 322596 + ... + 328337.

It is an arithmetic number, because the mean of its divisors is an integer number (126932130).

Almost surely, 2^1868828643 is an apocalyptic number.

1868828643 is a deficient number, since it is larger than the sum of its proper divisors (1177542477).

1868828643 is a wasteful number, since it uses less digits than its factorization.

1868828643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650979 (or 650976 counting only the distinct ones).

The product of its digits is 3538944, while the sum is 54.

The square root of 1868828643 is about 43229.9507633307. The cubic root of 1868828643 is about 1231.7516723712.

It can be divided in two parts, 18688286 and 43, that added together give a square (18688329 = 4323²).

The spelling of 1868828643 in words is "one billion, eight hundred sixty-eight million, eight hundred twenty-eight thousand, six hundred forty-three".