28905646 has 16 divisors (see below), whose sum is σ = 54057600. Its totient is φ = 11261880.

The previous prime is 28905637. The next prime is 28905649. The reversal of 28905646 is 64650982.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28905599 and 28905608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28905649) 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, 93696 + ... + 94003.

It is an arithmetic number, because the mean of its divisors is an integer number (3378600).

Almost surely, 2^28905646 is an apocalyptic number.

28905646 is a deficient number, since it is larger than the sum of its proper divisors (25151954).

28905646 is a wasteful number, since it uses less digits than its factorization.

28905646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187719.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 28905646 is about 5376.3971207492. The cubic root of 28905646 is about 306.8981189590.

The spelling of 28905646 in words is "twenty-eight million, nine hundred five thousand, six hundred forty-six".