28306806 has 64 divisors (see below), whose sum is σ = 64281600. Its totient is φ = 8236800.

The previous prime is 28306799. The next prime is 28306807. The reversal of 28306806 is 60860382.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28306807) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 318010 + ... + 318098.

It is an arithmetic number, because the mean of its divisors is an integer number (1004400).

Almost surely, 2^28306806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28306806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32140800).

28306806 is an abundant number, since it is smaller than the sum of its proper divisors (35974794).

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

28306806 is a wasteful number, since it uses less digits than its factorization.

28306806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 28306806 is about 5320.4140816294. The cubic root of 28306806 is about 304.7639703969.

The spelling of 28306806 in words is "twenty-eight million, three hundred six thousand, eight hundred six".