1990736180 has 24 divisors (see below), whose sum is σ = 4259426472. Its totient is φ = 781269632.

The previous prime is 1990736171. The next prime is 1990736203. The reversal of 1990736180 is 816370991.

It can be written as a sum of positive squares in 4 ways, for example, as 19731364 + 1971004816 = 4442^2 + 44396^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 937967 + ... + 940086.

It is an arithmetic number, because the mean of its divisors is an integer number (177476103).

Almost surely, 2^1990736180 is an apocalyptic number.

1990736180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1990736180 is an abundant number, since it is smaller than the sum of its proper divisors (2268690292).

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

1990736180 is a wasteful number, since it uses less digits than its factorization.

1990736180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1878115 (or 1878113 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 1990736180 is about 44617.6666803633. Note that the first 4 decimals coincide. The cubic root of 1990736180 is about 1257.9727583844.

The spelling of 1990736180 in words is "one billion, nine hundred ninety million, seven hundred thirty-six thousand, one hundred eighty".