28004395 has 8 divisors (see below), whose sum is σ = 34387056. Its totient is φ = 21882336.

The previous prime is 28004393. The next prime is 28004419. The reversal of 28004395 is 59340082.

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 28004395 - 2¹ = 28004393 is a prime.

It is a super-2 number, since 2×28004395² = 1568492278632050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28004393) 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, 64912 + ... + 65341.

It is an arithmetic number, because the mean of its divisors is an integer number (4298382).

Almost surely, 2^28004395 is an apocalyptic number.

28004395 is a deficient number, since it is larger than the sum of its proper divisors (6382661).

28004395 is a wasteful number, since it uses less digits than its factorization.

28004395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130301.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 28004395 is about 5291.9178942988. The cubic root of 28004395 is about 303.6747842237.

The spelling of 28004395 in words is "twenty-eight million, four thousand, three hundred ninety-five".