1981774080 has 576 divisors, whose sum is σ = 8282615040. Its totient is φ = 442368000.

The previous prime is 1981774051. The next prime is 1981774103. The reversal of 1981774080 is 804771891.

It is a tau number, because it is divible by the number of its divisors (576).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4941880 + ... + 4942280.

It is an arithmetic number, because the mean of its divisors is an integer number (14379540).

Almost surely, 2^1981774080 is an apocalyptic number.

1981774080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1981774080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4141307520).

1981774080 is an abundant number, since it is smaller than the sum of its proper divisors (6300840960).

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

1981774080 is a wasteful number, since it uses less digits than its factorization.

1981774080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455 (or 435 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 45.

The square root of 1981774080 is about 44517.1212007246. The cubic root of 1981774080 is about 1256.0821615827.

The spelling of 1981774080 in words is "one billion, nine hundred eighty-one million, seven hundred seventy-four thousand, eighty".