28005432 has 64 divisors (see below), whose sum is σ = 86177280. Its totient is φ = 7385472.

The previous prime is 28005407. The next prime is 28005433. The reversal of 28005432 is 23450082.

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 (28005433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4228 + ... + 8595.

It is an arithmetic number, because the mean of its divisors is an integer number (1346520).

Almost surely, 2^28005432 is an apocalyptic number.

It is an amenable number.

28005432 is an abundant number, since it is smaller than the sum of its proper divisors (58171848).

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

28005432 is a wasteful number, since it uses less digits than its factorization.

28005432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12852 (or 12848 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 28005432 is about 5292.0158729921. The cubic root of 28005432 is about 303.6785325266.

The spelling of 28005432 in words is "twenty-eight million, five thousand, four hundred thirty-two".