28271623 has 4 divisors (see below), whose sum is σ = 29500848. Its totient is φ = 27042400.

The previous prime is 28271611. The next prime is 28271671. The reversal of 28271623 is 32617282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32617282 = 2 ⋅16308641.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28271623 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 (28271693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 614578 + ... + 614623.

It is an arithmetic number, because the mean of its divisors is an integer number (7375212).

Almost surely, 2^28271623 is an apocalyptic number.

28271623 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28271623 is a deficient number, since it is larger than the sum of its proper divisors (1229225).

28271623 is a wasteful number, since it uses less digits than its factorization.

28271623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229224.

The product of its digits is 8064, while the sum is 31.

The square root of 28271623 is about 5317.1066380128. The cubic root of 28271623 is about 304.6376526457.

The spelling of 28271623 in words is "twenty-eight million, two hundred seventy-one thousand, six hundred twenty-three".