28208534 has 8 divisors (see below), whose sum is σ = 44152560. Its totient is φ = 13491016.

The previous prime is 28208489. The next prime is 28208539. The reversal of 28208534 is 43580282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 28208534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28208539) 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, 306569 + ... + 306660.

It is an arithmetic number, because the mean of its divisors is an integer number (5519070).

Almost surely, 2^28208534 is an apocalyptic number.

28208534 is a deficient number, since it is larger than the sum of its proper divisors (15944026).

28208534 is a wasteful number, since it uses less digits than its factorization.

28208534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613254.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 28208534 is about 5311.1706807445. The cubic root of 28208534 is about 304.4108811021.

The spelling of 28208534 in words is "twenty-eight million, two hundred eight thousand, five hundred thirty-four".