1863428556 has 36 divisors (see below), whose sum is σ = 4779210296. Its totient is φ = 564674880.

The previous prime is 1863428533. The next prime is 1863428563. The reversal of 1863428556 is 6558243681.

It is a happy number.

1863428556 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 640225 + ... + 643128.

Almost surely, 2^1863428556 is an apocalyptic number.

It is an amenable number.

1863428556 is an abundant number, since it is smaller than the sum of its proper divisors (2915781740).

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

1863428556 is a wasteful number, since it uses less digits than its factorization.

1863428556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283382 (or 1283369 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 48.

The square root of 1863428556 is about 43167.4478745269. The cubic root of 1863428556 is about 1230.5641222239.

The spelling of 1863428556 in words is "one billion, eight hundred sixty-three million, four hundred twenty-eight thousand, five hundred fifty-six".