28349405 has 8 divisors (see below), whose sum is σ = 38879232. Its totient is φ = 19439568.

The previous prime is 28349401. The next prime is 28349417. The reversal of 28349405 is 50494382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28349405 - 2² = 28349401 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 809983 = 28349405 / (2 + 8 + 3 + 4 + 9 + 4 + 0 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28349401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404957 + ... + 405026.

It is an arithmetic number, because the mean of its divisors is an integer number (4859904).

Almost surely, 2^28349405 is an apocalyptic number.

It is an amenable number.

28349405 is a deficient number, since it is larger than the sum of its proper divisors (10529827).

28349405 is an equidigital number, since it uses as much as digits as its factorization.

28349405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809995.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 28349405 is about 5324.4159304096. The cubic root of 28349405 is about 304.9167738520.

The spelling of 28349405 in words is "twenty-eight million, three hundred forty-nine thousand, four hundred five".