1998770056 has 16 divisors (see below), whose sum is σ = 3944941200. Its totient is φ = 946785744.

The previous prime is 1998770047. The next prime is 1998770057. The reversal of 1998770056 is 6500778991.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1998769985 and 1998770012.

It is not an unprimeable number, because it can be changed into a prime (1998770057) 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, 6574750 + ... + 6575053.

It is an arithmetic number, because the mean of its divisors is an integer number (246558825).

Almost surely, 2^1998770056 is an apocalyptic number.

It is an amenable number.

1998770056 is a deficient number, since it is larger than the sum of its proper divisors (1946171144).

1998770056 is a wasteful number, since it uses less digits than its factorization.

1998770056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13149828 (or 13149824 counting only the distinct ones).

The product of its (nonzero) digits is 952560, while the sum is 52.

The square root of 1998770056 is about 44707.6062432334. The cubic root of 1998770056 is about 1259.6627248775.

The spelling of 1998770056 in words is "one billion, nine hundred ninety-eight million, seven hundred seventy thousand, fifty-six".