28898533 has 4 divisors (see below), whose sum is σ = 28910560. Its totient is φ = 28886508.

The previous prime is 28898509. The next prime is 28898539. The reversal of 28898533 is 33589882.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 33589882 = 2 ⋅16794941.

It is a cyclic number.

It is not a de Polignac number, because 28898533 - 2⁵ = 28898501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28898539) 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, 1035 + ... + 7672.

It is an arithmetic number, because the mean of its divisors is an integer number (7227640).

Almost surely, 2^28898533 is an apocalyptic number.

It is an amenable number.

28898533 is a deficient number, since it is larger than the sum of its proper divisors (12027).

28898533 is an equidigital number, since it uses as much as digits as its factorization.

28898533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12026.

The product of its digits is 414720, while the sum is 46.

The square root of 28898533 is about 5375.7355775745. The cubic root of 28898533 is about 306.8729434229.

The spelling of 28898533 in words is "twenty-eight million, eight hundred ninety-eight thousand, five hundred thirty-three".