28381436 has 6 divisors (see below), whose sum is σ = 49667520. Its totient is φ = 14190716.

The previous prime is 28381417. The next prime is 28381439. The reversal of 28381436 is 63418382.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28381396 and 28381405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28381439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3547676 + ... + 3547683.

It is an arithmetic number, because the mean of its divisors is an integer number (8277920).

Almost surely, 2^28381436 is an apocalyptic number.

It is an amenable number.

28381436 is a deficient number, since it is larger than the sum of its proper divisors (21286084).

28381436 is a wasteful number, since it uses less digits than its factorization.

28381436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7095363 (or 7095361 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 28381436 is about 5327.4230168065. The cubic root of 28381436 is about 305.0315688904.

The spelling of 28381436 in words is "twenty-eight million, three hundred eighty-one thousand, four hundred thirty-six".