28215653 has 2 divisors, whose sum is σ = 28215654. Its totient is φ = 28215652.

The previous prime is 28215619. The next prime is 28215659. The reversal of 28215653 is 35651282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14915044 + 13300609 = 3862^2 + 3647^2 .

It is a cyclic number.

It is not a de Polignac number, because 28215653 - 2¹⁸ = 27953509 is a prime.

It is a super-2 number, since 2×28215653² = 1592246148432818, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28215659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14107826 + 14107827.

It is an arithmetic number, because the mean of its divisors is an integer number (14107827).

Almost surely, 2^28215653 is an apocalyptic number.

It is an amenable number.

28215653 is a deficient number, since it is larger than the sum of its proper divisors (1).

28215653 is an equidigital number, since it uses as much as digits as its factorization.

28215653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 32.

The square root of 28215653 is about 5311.8408296936. The cubic root of 28215653 is about 304.4364870504.

The spelling of 28215653 in words is "twenty-eight million, two hundred fifteen thousand, six hundred fifty-three".