28533961 has 4 divisors (see below), whose sum is σ = 29774592. Its totient is φ = 27293332.

The previous prime is 28533959. The next prime is 28534001. The reversal of 28533961 is 16933582.

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.

It is a cyclic number.

It is not a de Polignac number, because 28533961 - 2¹ = 28533959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28533961.

It is not an unprimeable number, because it can be changed into a prime (28533061) 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 3 ways as a sum of consecutive naturals, for example, 620281 + ... + 620326.

It is an arithmetic number, because the mean of its divisors is an integer number (7443648).

Almost surely, 2^28533961 is an apocalyptic number.

It is an amenable number.

28533961 is a deficient number, since it is larger than the sum of its proper divisors (1240631).

28533961 is a wasteful number, since it uses less digits than its factorization.

28533961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240630.

The product of its digits is 38880, while the sum is 37.

The square root of 28533961 is about 5341.7189181012. The cubic root of 28533961 is about 305.5770175020.

The spelling of 28533961 in words is "twenty-eight million, five hundred thirty-three thousand, nine hundred sixty-one".