28528639 has 2 divisors, whose sum is σ = 28528640. Its totient is φ = 28528638.

The previous prime is 28528609. The next prime is 28528657. The reversal of 28528639 is 93682582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28528639 - 2⁵ = 28528607 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28528595 and 28528604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28528609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14264319 + 14264320.

It is an arithmetic number, because the mean of its divisors is an integer number (14264320).

Almost surely, 2^28528639 is an apocalyptic number.

28528639 is a deficient number, since it is larger than the sum of its proper divisors (1).

28528639 is an equidigital number, since it uses as much as digits as its factorization.

28528639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 43.

The square root of 28528639 is about 5341.2207406173. The cubic root of 28528639 is about 305.5580181301.

The spelling of 28528639 in words is "twenty-eight million, five hundred twenty-eight thousand, six hundred thirty-nine".