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28578257 is a prime number
BaseRepresentation
bin110110100000…
…1000111010001
31222202220222222
41231001013101
524304001012
62500310425
7464624351
oct155010721
958686888
1028578257
111514a2a4
1296a2415
135bc7b16
143b1cb61
152797972
hex1b411d1

28578257 has 2 divisors, whose sum is σ = 28578258. Its totient is φ = 28578256.

The previous prime is 28578217. The next prime is 28578269. The reversal of 28578257 is 75287582.

28578257 is nontrivially palindromic in base 15.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21864976 + 6713281 = 4676^2 + 2591^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-28578257 is a prime.

It is not a weakly prime, because it can be changed into another prime (28578217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14289128 + 14289129.

It is an arithmetic number, because the mean of its divisors is an integer number (14289129).

Almost surely, 228578257 is an apocalyptic number.

It is an amenable number.

28578257 is a deficient number, since it is larger than the sum of its proper divisors (1).

28578257 is an equidigital number, since it uses as much as digits as its factorization.

28578257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 313600, while the sum is 44.

The square root of 28578257 is about 5345.8635410942. The cubic root of 28578257 is about 305.7350612366.

The spelling of 28578257 in words is "twenty-eight million, five hundred seventy-eight thousand, two hundred fifty-seven".