103999728 has 40 divisors (see below), whose sum is σ = 307047808. Its totient is φ = 29714112.

The previous prime is 103999723. The next prime is 103999729. The reversal of 103999728 is 827999301.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103999723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154426 + ... + 155097.

Almost surely, 2^103999728 is an apocalyptic number.

It is an amenable number.

103999728 is an abundant number, since it is smaller than the sum of its proper divisors (203048080).

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

103999728 is a wasteful number, since it uses less digits than its factorization.

103999728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309541 (or 309535 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 48.

The square root of 103999728 is about 10198.0256912797. The cubic root of 103999728 is about 470.2665275675.

The spelling of 103999728 in words is "one hundred three million, nine hundred ninety-nine thousand, seven hundred twenty-eight".