28435661 has 2 divisors, whose sum is σ = 28435662. Its totient is φ = 28435660.

The previous prime is 28435657. The next prime is 28435691. The reversal of 28435661 is 16653482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24314761 + 4120900 = 4931^2 + 2030^2 .

It is a cyclic number.

It is not a de Polignac number, because 28435661 - 2² = 28435657 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28435601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14217830 + 14217831.

It is an arithmetic number, because the mean of its divisors is an integer number (14217831).

Almost surely, 2^28435661 is an apocalyptic number.

It is an amenable number.

28435661 is a deficient number, since it is larger than the sum of its proper divisors (1).

28435661 is an equidigital number, since it uses as much as digits as its factorization.

28435661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The square root of 28435661 is about 5332.5098218381. The cubic root of 28435661 is about 305.2257076943.

The spelling of 28435661 in words is "twenty-eight million, four hundred thirty-five thousand, six hundred sixty-one".