28404367 has 4 divisors (see below), whose sum is σ = 28470400. Its totient is φ = 28338336.

The previous prime is 28404361. The next prime is 28404377. The reversal of 28404367 is 76340482.

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

It is a cyclic number.

It is not a de Polignac number, because 28404367 - 2⁷ = 28404239 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 (28404361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32367 + ... + 33232.

It is an arithmetic number, because the mean of its divisors is an integer number (7117600).

Almost surely, 2^28404367 is an apocalyptic number.

28404367 is a deficient number, since it is larger than the sum of its proper divisors (66033).

28404367 is an equidigital number, since it uses as much as digits as its factorization.

28404367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66032.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 28404367 is about 5329.5747485142. The cubic root of 28404367 is about 305.1136976447.

The spelling of 28404367 in words is "twenty-eight million, four hundred four thousand, three hundred sixty-seven".