28532019 has 4 divisors (see below), whose sum is σ = 38042696. Its totient is φ = 19021344.

The previous prime is 28532003. The next prime is 28532033. The reversal of 28532019 is 91023582.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28532019 - 2⁴ = 28532003 is a prime.

It is a super-2 number, since 2×28532019² = 1628152216432722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28532039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4755334 + ... + 4755339.

It is an arithmetic number, because the mean of its divisors is an integer number (9510674).

Almost surely, 2^28532019 is an apocalyptic number.

28532019 is a deficient number, since it is larger than the sum of its proper divisors (9510677).

28532019 is an equidigital number, since it uses as much as digits as its factorization.

28532019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9510676.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 28532019 is about 5341.5371383151. The cubic root of 28532019 is about 305.5700848971.

The spelling of 28532019 in words is "twenty-eight million, five hundred thirty-two thousand, nineteen".