1998573624 has 24 divisors (see below), whose sum is σ = 5412803760. Its totient is φ = 666191184.

The previous prime is 1998573623. The next prime is 1998573631. The reversal of 1998573624 is 4263758991.

1998573624 is a `hidden beast` number, since 1 + 9 + 9 + 8 + 5 + 7 + 3 + 624 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998573623) 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 5 ways as a sum of consecutive naturals, for example, 13878912 + ... + 13879055.

It is an arithmetic number, because the mean of its divisors is an integer number (225533490).

Almost surely, 2^1998573624 is an apocalyptic number.

It is an amenable number.

1998573624 is an abundant number, since it is smaller than the sum of its proper divisors (3414230136).

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

1998573624 is a wasteful number, since it uses less digits than its factorization.

1998573624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27757979 (or 27757972 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The square root of 1998573624 is about 44705.4093371261. The cubic root of 1998573624 is about 1259.6214584707.

The spelling of 1998573624 in words is "one billion, nine hundred ninety-eight million, five hundred seventy-three thousand, six hundred twenty-four".