28644750 has 96 divisors (see below), whose sum is σ = 80308800. Its totient is φ = 7358400.

The previous prime is 28644743. The next prime is 28644767. The reversal of 28644750 is 5744682.

28644750 = T₁₃₉₁ + T₁₃₉₂ + ... + T₁₄₁₉.

28644750 is a `hidden beast` number, since 2 + 8 + 644 + 7 + 5 + 0 = 666.

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 47 ways as a sum of consecutive naturals, for example, 65031 + ... + 65469.

It is an arithmetic number, because the mean of its divisors is an integer number (836550).

Almost surely, 2^28644750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28644750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40154400).

28644750 is an abundant number, since it is smaller than the sum of its proper divisors (51664050).

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

28644750 is a wasteful number, since it uses less digits than its factorization.

28644750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 28644750 is about 5352.0790352909. The cubic root of 28644750 is about 305.9719953866.

The spelling of 28644750 in words is "twenty-eight million, six hundred forty-four thousand, seven hundred fifty".