28394427 has 8 divisors (see below), whose sum is σ = 38782800. Its totient is φ = 18467840.

The previous prime is 28394413. The next prime is 28394441. The reversal of 28394427 is 72449382.

It is an interprime number because it is at equal distance from previous prime (28394413) and next prime (28394441).

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 28394427 - 2⁴ = 28394411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28394407) 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, 115302 + ... + 115547.

It is an arithmetic number, because the mean of its divisors is an integer number (4847850).

Almost surely, 2^28394427 is an apocalyptic number.

28394427 is a deficient number, since it is larger than the sum of its proper divisors (10388373).

28394427 is a wasteful number, since it uses less digits than its factorization.

28394427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230893.

The product of its digits is 96768, while the sum is 39.

The square root of 28394427 is about 5328.6421347281. The cubic root of 28394427 is about 305.0781023669.

The spelling of 28394427 in words is "twenty-eight million, three hundred ninety-four thousand, four hundred twenty-seven".