1980623690 has 16 divisors (see below), whose sum is σ = 3661477992. Its totient is φ = 770837184.

The previous prime is 1980623683. The next prime is 1980623719. The reversal of 1980623690 is 963260891.

1980623690 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1979271121 + 1352569 = 44489^2 + 1163^2 .

It is a super-2 number, since 2×1980623690² = 7845740402778432200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2676149 + ... + 2676888.

Almost surely, 2^1980623690 is an apocalyptic number.

1980623690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1980623690 is a deficient number, since it is larger than the sum of its proper divisors (1680854302).

1980623690 is a wasteful number, since it uses less digits than its factorization.

1980623690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5353081.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 1980623690 is about 44504.1985659780. The cubic root of 1980623690 is about 1255.8390689483.

The spelling of 1980623690 in words is "one billion, nine hundred eighty million, six hundred twenty-three thousand, six hundred ninety".