28473391 has 2 divisors, whose sum is σ = 28473392. Its totient is φ = 28473390.

The previous prime is 28473383. The next prime is 28473409. The reversal of 28473391 is 19337482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28473391 - 2³ = 28473383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28473391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28473301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14236695 + 14236696.

It is an arithmetic number, because the mean of its divisors is an integer number (14236696).

Almost surely, 2^28473391 is an apocalyptic number.

28473391 is a deficient number, since it is larger than the sum of its proper divisors (1).

28473391 is an equidigital number, since it uses as much as digits as its factorization.

28473391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 28473391 is about 5336.0463828569. The cubic root of 28473391 is about 305.3606447870.

The spelling of 28473391 in words is "twenty-eight million, four hundred seventy-three thousand, three hundred ninety-one".