28381430 has 128 divisors (see below), whose sum is σ = 69672960. Its totient is φ = 8064000.

The previous prime is 28381417. The next prime is 28381439. The reversal of 28381430 is 3418382.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a junction number, because it is equal to n+sod(n) for n = 28381393 and 28381402.

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 in 63 ways as a sum of consecutive naturals, for example, 692210 + ... + 692250.

It is an arithmetic number, because the mean of its divisors is an integer number (544320).

Almost surely, 2^28381430 is an apocalyptic number.

28381430 is an abundant number, since it is smaller than the sum of its proper divisors (41291530).

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

28381430 is a wasteful number, since it uses less digits than its factorization.

28381430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28381430 is about 5327.4224536825. The cubic root of 28381430 is about 305.0315473952.

The spelling of 28381430 in words is "twenty-eight million, three hundred eighty-one thousand, four hundred thirty".