28694820 has 96 divisors (see below), whose sum is σ = 100187136. Its totient is φ = 5961600.

The previous prime is 28694801. The next prime is 28694849. The reversal of 28694820 is 2849682.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1515 + ... + 7725.

It is an arithmetic number, because the mean of its divisors is an integer number (1043616).

Almost surely, 2^28694820 is an apocalyptic number.

28694820 is a gapful number since it is divisible by the number (20) 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 28694820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50093568).

28694820 is an abundant number, since it is smaller than the sum of its proper divisors (71492316).

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

28694820 is a wasteful number, since it uses less digits than its factorization.

28694820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6241 (or 6239 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 28694820 is about 5356.7546145031. The cubic root of 28694820 is about 306.1501676542.

The spelling of 28694820 in words is "twenty-eight million, six hundred ninety-four thousand, eight hundred twenty".