28656491 has 2 divisors, whose sum is σ = 28656492. Its totient is φ = 28656490.

The previous prime is 28656479. The next prime is 28656571. The reversal of 28656491 is 19465682.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28656491 - 2¹⁰ = 28655467 is a prime.

It is a super-3 number, since 3×28656491³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28656401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14328245 + 14328246.

It is an arithmetic number, because the mean of its divisors is an integer number (14328246).

Almost surely, 2^28656491 is an apocalyptic number.

28656491 is a deficient number, since it is larger than the sum of its proper divisors (1).

28656491 is an equidigital number, since it uses as much as digits as its factorization.

28656491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 41.

The square root of 28656491 is about 5353.1757863907. The cubic root of 28656491 is about 306.0137939301.

The spelling of 28656491 in words is "twenty-eight million, six hundred fifty-six thousand, four hundred ninety-one".