28380429 has 96 divisors (see below), whose sum is σ = 56689920. Its totient is φ = 13685760.

The previous prime is 28380427. The next prime is 28380431. The reversal of 28380429 is 92408382.

It is an interprime number because it is at equal distance from previous prime (28380427) and next prime (28380431).

It is not a de Polignac number, because 28380429 - 2¹ = 28380427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28380393 and 28380402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28380421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 388737 + ... + 388809.

It is an arithmetic number, because the mean of its divisors is an integer number (590520).

Almost surely, 2^28380429 is an apocalyptic number.

It is an amenable number.

28380429 is a deficient number, since it is larger than the sum of its proper divisors (28309491).

28380429 is a wasteful number, since it uses less digits than its factorization.

28380429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 28380429 is about 5327.3285049826. The cubic root of 28380429 is about 305.0279612456.

The spelling of 28380429 in words is "twenty-eight million, three hundred eighty thousand, four hundred twenty-nine".