28104071 has 4 divisors (see below), whose sum is σ = 28118544. Its totient is φ = 28089600.

The previous prime is 28104047. The next prime is 28104107. The reversal of 28104071 is 17040182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17040182 = 2 ⋅8520091.

It is a cyclic number.

It is not a de Polignac number, because 28104071 - 2⁶ = 28104007 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 (28104031) 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, 3770 + ... + 8391.

It is an arithmetic number, because the mean of its divisors is an integer number (7029636).

Almost surely, 2^28104071 is an apocalyptic number.

28104071 is a deficient number, since it is larger than the sum of its proper divisors (14473).

28104071 is a wasteful number, since it uses less digits than its factorization.

28104071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14472.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 28104071 is about 5301.3272866330. The cubic root of 28104071 is about 304.0346473380.

The spelling of 28104071 in words is "twenty-eight million, one hundred four thousand, seventy-one".