28610993 has 2 divisors, whose sum is σ = 28610994. Its totient is φ = 28610992.

The previous prime is 28610971. The next prime is 28610999. The reversal of 28610993 is 39901682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19562929 + 9048064 = 4423^2 + 3008^2 .

It is a cyclic number.

It is not a de Polignac number, because 28610993 - 2²⁰ = 27562417 is a prime.

It is not a weakly prime, because it can be changed into another prime (28610999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14305496 + 14305497.

It is an arithmetic number, because the mean of its divisors is an integer number (14305497).

Almost surely, 2^28610993 is an apocalyptic number.

It is an amenable number.

28610993 is a deficient number, since it is larger than the sum of its proper divisors (1).

28610993 is an equidigital number, since it uses as much as digits as its factorization.

28610993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 28610993 is about 5348.9244713307. The cubic root of 28610993 is about 305.8517551255.

The spelling of 28610993 in words is "twenty-eight million, six hundred ten thousand, nine hundred ninety-three".