28405152 has 144 divisors (see below), whose sum is σ = 88452000. Its totient is φ = 8612352.

The previous prime is 28405141. The next prime is 28405187. The reversal of 28405152 is 25150482.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 158599 + ... + 158777.

It is an arithmetic number, because the mean of its divisors is an integer number (614250).

Almost surely, 2^28405152 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 28405152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44226000).

28405152 is an abundant number, since it is smaller than the sum of its proper divisors (60046848).

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

28405152 is a wasteful number, since it uses less digits than its factorization.

28405152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 28405152 is about 5329.6483936560. The cubic root of 28405152 is about 305.1165083867.

The spelling of 28405152 in words is "twenty-eight million, four hundred five thousand, one hundred fifty-two".