28306208 has 48 divisors (see below), whose sum is σ = 64338624. Its totient is φ = 12007680.

The previous prime is 28306177. The next prime is 28306211. The reversal of 28306208 is 80260382.

It is a super-2 number, since 2×28306208² = 1602482822678528, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23378 + ... + 24558.

It is an arithmetic number, because the mean of its divisors is an integer number (1340388).

Almost surely, 2^28306208 is an apocalyptic number.

28306208 is a gapful number since it is divisible by the number (28) 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 28306208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32169312).

28306208 is an abundant number, since it is smaller than the sum of its proper divisors (36032416).

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

28306208 is a wasteful number, since it uses less digits than its factorization.

28306208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305 (or 1297 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28306208 is about 5320.3578826992. The cubic root of 28306208 is about 304.7618242683.

The spelling of 28306208 in words is "twenty-eight million, three hundred six thousand, two hundred eight".