28381932 has 18 divisors (see below), whose sum is σ = 71743308. Its totient is φ = 9460632.

The previous prime is 28381919. The next prime is 28381939. The reversal of 28381932 is 23918382.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 788387 = 28381932 / (2 + 8 + 3 + 8 + 1 + 9 + 3 + 2).

It is not an unprimeable number, because it can be changed into a prime (28381939) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 394158 + ... + 394229.

Almost surely, 2^28381932 is an apocalyptic number.

It is an amenable number.

28381932 is an abundant number, since it is smaller than the sum of its proper divisors (43361376).

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

28381932 is a wasteful number, since it uses less digits than its factorization.

28381932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788397 (or 788392 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 28381932 is about 5327.4695681909. The cubic root of 28381932 is about 305.0333458122.

It can be divided in two parts, 2838 and 1932, that multiplied together give a triangular number (5483016 = T₃₃₁₁).

The spelling of 28381932 in words is "twenty-eight million, three hundred eighty-one thousand, nine hundred thirty-two".