28208532 has 48 divisors (see below), whose sum is σ = 74289600. Its totient is φ = 8252160.

The previous prime is 28208489. The next prime is 28208539. The reversal of 28208532 is 23580282.

It is a self number, because there is not a number n which added to its sum of digits gives 28208532.

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 15 ways as a sum of consecutive naturals, for example, 144 + ... + 7512.

It is an arithmetic number, because the mean of its divisors is an integer number (1547700).

Almost surely, 2^28208532 is an apocalyptic number.

28208532 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28208532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37144800).

28208532 is an abundant number, since it is smaller than the sum of its proper divisors (46081068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28208532 is a wasteful number, since it uses less digits than its factorization.

28208532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7416 (or 7414 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 28208532 is about 5311.1704924621. The cubic root of 28208532 is about 304.4108739078.

The spelling of 28208532 in words is "twenty-eight million, two hundred eight thousand, five hundred thirty-two".