1998776508 has 24 divisors (see below), whose sum is σ = 4740269520. Its totient is φ = 655336320.

The previous prime is 1998776501. The next prime is 1998776509. The reversal of 1998776508 is 8056778991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998776501) by changing a digit.

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, 1364553 + ... + 1366016.

It is an arithmetic number, because the mean of its divisors is an integer number (197511230).

Almost surely, 2^1998776508 is an apocalyptic number.

It is an amenable number.

1998776508 is an abundant number, since it is smaller than the sum of its proper divisors (2741493012).

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

1998776508 is a wasteful number, since it uses less digits than its factorization.

1998776508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2730637 (or 2730635 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 60.

The square root of 1998776508 is about 44707.6784009190. The cubic root of 1998776508 is about 1259.6640802668.

The spelling of 1998776508 in words is "one billion, nine hundred ninety-eight million, seven hundred seventy-six thousand, five hundred eight".