28530277 has 2 divisors, whose sum is σ = 28530278. Its totient is φ = 28530276.

The previous prime is 28530259. The next prime is 28530283. The reversal of 28530277 is 77203582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26718561 + 1811716 = 5169^2 + 1346^2 .

It is a cyclic number.

It is not a de Polignac number, because 28530277 - 2⁷ = 28530149 is a prime.

It is equal to p_1772377 and since 28530277 and 1772377 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28530247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14265138 + 14265139.

It is an arithmetic number, because the mean of its divisors is an integer number (14265139).

Almost surely, 2^28530277 is an apocalyptic number.

It is an amenable number.

28530277 is a deficient number, since it is larger than the sum of its proper divisors (1).

28530277 is an equidigital number, since it uses as much as digits as its factorization.

28530277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 28530277 is about 5341.3740741498. The cubic root of 28530277 is about 305.5638659901.

The spelling of 28530277 in words is "twenty-eight million, five hundred thirty thousand, two hundred seventy-seven".