28905633 has 8 divisors (see below), whose sum is σ = 42823200. Its totient is φ = 19270404.

The previous prime is 28905629. The next prime is 28905637. The reversal of 28905633 is 33650982.

28905633 is a `hidden beast` number, since 2 + 8 + 90 + 563 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (28905629) and next prime (28905637).

It is not a de Polignac number, because 28905633 - 2² = 28905629 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28905637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 535263 + ... + 535316.

It is an arithmetic number, because the mean of its divisors is an integer number (5352900).

Almost surely, 2^28905633 is an apocalyptic number.

It is an amenable number.

28905633 is a deficient number, since it is larger than the sum of its proper divisors (13917567).

28905633 is a wasteful number, since it uses less digits than its factorization.

28905633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070588 (or 1070582 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 28905633 is about 5376.3959117610. The cubic root of 28905633 is about 306.8980729510.

The spelling of 28905633 in words is "twenty-eight million, nine hundred five thousand, six hundred thirty-three".