19990528 has 48 divisors (see below), whose sum is σ = 41081040. Its totient is φ = 9719808.

The previous prime is 19990513. The next prime is 19990559. The reversal of 19990528 is 82509991.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87951 + ... + 88177.

It is an arithmetic number, because the mean of its divisors is an integer number (855855).

Almost surely, 2^19990528 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19990528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20540520).

19990528 is an abundant number, since it is smaller than the sum of its proper divisors (21090512).

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

19990528 is an equidigital number, since it uses as much as digits as its factorization.

19990528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 43.

The square root of 19990528 is about 4471.0768277899. The cubic root of 19990528 is about 271.3989032868.

The spelling of 19990528 in words is "nineteen million, nine hundred ninety thousand, five hundred twenty-eight".