1980545456 has 20 divisors (see below), whose sum is σ = 4004146992. Its totient is φ = 947217216.

The previous prime is 1980545447. The next prime is 1980545477. The reversal of 1980545456 is 6545450891.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1980545456.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2690591 + ... + 2691326.

Almost surely, 2^1980545456 is an apocalyptic number.

1980545456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1980545456 is an abundant number, since it is smaller than the sum of its proper divisors (2023601536).

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

1980545456 is a wasteful number, since it uses less digits than its factorization.

1980545456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5381948 (or 5381942 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 47.

The square root of 1980545456 is about 44503.3196065192. The cubic root of 1980545456 is about 1255.8225336506.

The spelling of 1980545456 in words is "one billion, nine hundred eighty million, five hundred forty-five thousand, four hundred fifty-six".