28578047 has 2 divisors, whose sum is σ = 28578048. Its totient is φ = 28578046.

The previous prime is 28578031. The next prime is 28578083. The reversal of 28578047 is 74087582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28578047 - 2⁴ = 28578031 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28577995 and 28578013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28578947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14289023 + 14289024.

It is an arithmetic number, because the mean of its divisors is an integer number (14289024).

Almost surely, 2^28578047 is an apocalyptic number.

28578047 is a deficient number, since it is larger than the sum of its proper divisors (1).

28578047 is an equidigital number, since it uses as much as digits as its factorization.

28578047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 125440, while the sum is 41.

The square root of 28578047 is about 5345.8438997038. The cubic root of 28578047 is about 305.7343123628.

The spelling of 28578047 in words is "twenty-eight million, five hundred seventy-eight thousand, forty-seven".