28347407 has 4 divisors (see below), whose sum is σ = 30924456. Its totient is φ = 25770360.

The previous prime is 28347353. The next prime is 28347409. The reversal of 28347407 is 70474382.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28347407 - 2⁶ = 28347343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28347409) 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 3 ways as a sum of consecutive naturals, for example, 1288508 + ... + 1288529.

It is an arithmetic number, because the mean of its divisors is an integer number (7731114).

Almost surely, 2^28347407 is an apocalyptic number.

28347407 is a deficient number, since it is larger than the sum of its proper divisors (2577049).

28347407 is a wasteful number, since it uses less digits than its factorization.

28347407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2577048.

The product of its (nonzero) digits is 37632, while the sum is 35.

The square root of 28347407 is about 5324.2283008902. The cubic root of 28347407 is about 304.9096104092.

The spelling of 28347407 in words is "twenty-eight million, three hundred forty-seven thousand, four hundred seven".