28904229 has 8 divisors (see below), whose sum is σ = 42821120. Its totient is φ = 19269468.

The previous prime is 28904219. The next prime is 28904243. The reversal of 28904229 is 92240982.

It is not a de Polignac number, because 28904229 - 2⁷ = 28904101 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28904193 and 28904202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28904209) 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, 535237 + ... + 535290.

It is an arithmetic number, because the mean of its divisors is an integer number (5352640).

Almost surely, 2^28904229 is an apocalyptic number.

It is an amenable number.

28904229 is a deficient number, since it is larger than the sum of its proper divisors (13916891).

28904229 is a wasteful number, since it uses less digits than its factorization.

28904229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070536 (or 1070530 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 28904229 is about 5376.2653394341. The cubic root of 28904229 is about 306.8931040017.

The spelling of 28904229 in words is "twenty-eight million, nine hundred four thousand, two hundred twenty-nine".