28569408 has 112 divisors (see below), whose sum is σ = 89489280. Its totient is φ = 7870464.

The previous prime is 28569391. The next prime is 28569413. The reversal of 28569408 is 80496582.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×28569408² = 1632422146940928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 28569408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38610 + ... + 39342.

Almost surely, 2^28569408 is an apocalyptic number.

28569408 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 28569408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44744640).

28569408 is an abundant number, since it is smaller than the sum of its proper divisors (60919872).

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

28569408 is a wasteful number, since it uses less digits than its factorization.

28569408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784 (or 774 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 28569408 is about 5345.0358277564. The cubic root of 28569408 is about 305.7035019425.

The spelling of 28569408 in words is "twenty-eight million, five hundred sixty-nine thousand, four hundred eight".