1999736028 has 36 divisors (see below), whose sum is σ = 5058963000. Its totient is φ = 666041376.

The previous prime is 1999736023. The next prime is 1999736041. The reversal of 1999736028 is 8206379991.

1999736028 is a `hidden beast` number, since 199 + 97 + 360 + 2 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999736021) 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 11 ways as a sum of consecutive naturals, for example, 24223 + ... + 67721.

It is an arithmetic number, because the mean of its divisors is an integer number (140526750).

Almost surely, 2^1999736028 is an apocalyptic number.

1999736028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1999736028 is an abundant number, since it is smaller than the sum of its proper divisors (3059226972).

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

1999736028 is a wasteful number, since it uses less digits than its factorization.

1999736028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44786 (or 44781 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The square root of 1999736028 is about 44718.4081559261. The cubic root of 1999736028 is about 1259.8656168094.

The spelling of 1999736028 in words is "one billion, nine hundred ninety-nine million, seven hundred thirty-six thousand, twenty-eight".