28421568 has 252 divisors, whose sum is σ = 101635560. Its totient is φ = 7547904.

The previous prime is 28421567. The next prime is 28421597. The reversal of 28421568 is 86512482.

It is a tau number, because it is divible by the number of its divisors (252).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28421567) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 536230 + ... + 536282.

Almost surely, 2^28421568 is an apocalyptic number.

28421568 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 28421568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50817780).

28421568 is an abundant number, since it is smaller than the sum of its proper divisors (73213992).

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

28421568 is a wasteful number, since it uses less digits than its factorization.

28421568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 84 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 28421568 is about 5331.1882352811. The cubic root of 28421568 is about 305.1752750500.

The spelling of 28421568 in words is "twenty-eight million, four hundred twenty-one thousand, five hundred sixty-eight".