28493561 has 2 divisors, whose sum is σ = 28493562. Its totient is φ = 28493560.

The previous prime is 28493551. The next prime is 28493627. The reversal of 28493561 is 16539482.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25452025 + 3041536 = 5045^2 + 1744^2 .

It is a cyclic number.

It is not a de Polignac number, because 28493561 - 2¹⁰ = 28492537 is a prime.

It is not a weakly prime, because it can be changed into another prime (28493501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14246780 + 14246781.

It is an arithmetic number, because the mean of its divisors is an integer number (14246781).

Almost surely, 2^28493561 is an apocalyptic number.

It is an amenable number.

28493561 is a deficient number, since it is larger than the sum of its proper divisors (1).

28493561 is an equidigital number, since it uses as much as digits as its factorization.

28493561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 28493561 is about 5337.9360243450. The cubic root of 28493561 is about 305.4327316281.

The spelling of 28493561 in words is "twenty-eight million, four hundred ninety-three thousand, five hundred sixty-one".