28612517 has 2 divisors, whose sum is σ = 28612518. Its totient is φ = 28612516.

The previous prime is 28612511. The next prime is 28612523. The reversal of 28612517 is 71521682.

It is a balanced prime because it is at equal distance from previous prime (28612511) and next prime (28612523).

It can be written as a sum of positive squares in only one way, i.e., 23951236 + 4661281 = 4894^2 + 2159^2 .

It is a cyclic number.

It is not a de Polignac number, because 28612517 - 2⁶ = 28612453 is a prime.

It is a super-2 number, since 2×28612517² = 1637352258150578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28612511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14306258 + 14306259.

It is an arithmetic number, because the mean of its divisors is an integer number (14306259).

Almost surely, 2^28612517 is an apocalyptic number.

It is an amenable number.

28612517 is a deficient number, since it is larger than the sum of its proper divisors (1).

28612517 is an equidigital number, since it uses as much as digits as its factorization.

28612517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 32.

The square root of 28612517 is about 5349.0669279791. The cubic root of 28612517 is about 305.8571855533.

The spelling of 28612517 in words is "twenty-eight million, six hundred twelve thousand, five hundred seventeen".