28620256 has 48 divisors (see below), whose sum is σ = 65390976. Its totient is φ = 12076416.

The previous prime is 28620247. The next prime is 28620281. The reversal of 28620256 is 65202682.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 14055 + ... + 15961.

It is an arithmetic number, because the mean of its divisors is an integer number (1362312).

Almost surely, 2^28620256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28620256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32695488).

28620256 is an abundant number, since it is smaller than the sum of its proper divisors (36770720).

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

28620256 is a wasteful number, since it uses less digits than its factorization.

28620256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1991 (or 1983 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 28620256 is about 5349.7902762632. The cubic root of 28620256 is about 305.8847587466.

The spelling of 28620256 in words is "twenty-eight million, six hundred twenty thousand, two hundred fifty-six".