28172479 has 2 divisors, whose sum is σ = 28172480. Its totient is φ = 28172478.

The previous prime is 28172477. The next prime is 28172513. The reversal of 28172479 is 97427182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28172479 - 2¹ = 28172477 is a prime.

Together with 28172477, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28172471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14086239 + 14086240.

It is an arithmetic number, because the mean of its divisors is an integer number (14086240).

Almost surely, 2^28172479 is an apocalyptic number.

28172479 is a deficient number, since it is larger than the sum of its proper divisors (1).

28172479 is an equidigital number, since it uses as much as digits as its factorization.

28172479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 40.

The square root of 28172479 is about 5307.7753343562. The cubic root of 28172479 is about 304.2811306065.

The spelling of 28172479 in words is "twenty-eight million, one hundred seventy-two thousand, four hundred seventy-nine".