28321152 has 64 divisors (see below), whose sum is σ = 75936960. Its totient is φ = 9351680.

The previous prime is 28321129. The next prime is 28321159. The reversal of 28321152 is 25112382.

It is a tau number, because it is divible by the number of its divisors (64).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28321159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50023 + ... + 50585.

It is an arithmetic number, because the mean of its divisors is an integer number (1186515).

Almost surely, 2^28321152 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 28321152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37968480).

28321152 is an abundant number, since it is smaller than the sum of its proper divisors (47615808).

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

28321152 is a wasteful number, since it uses less digits than its factorization.

28321152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711 (or 699 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

The square root of 28321152 is about 5321.7621141874. The cubic root of 28321152 is about 304.8154468925.

The spelling of 28321152 in words is "twenty-eight million, three hundred twenty-one thousand, one hundred fifty-two".