28555693 has 2 divisors, whose sum is σ = 28555694. Its totient is φ = 28555692.

The previous prime is 28555687. The next prime is 28555753. The reversal of 28555693 is 39655582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27846729 + 708964 = 5277^2 + 842^2 .

It is a cyclic number.

It is not a de Polignac number, because 28555693 - 2²¹ = 26458541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28555643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14277846 + 14277847.

It is an arithmetic number, because the mean of its divisors is an integer number (14277847).

Almost surely, 2^28555693 is an apocalyptic number.

It is an amenable number.

28555693 is a deficient number, since it is larger than the sum of its proper divisors (1).

28555693 is an equidigital number, since it uses as much as digits as its factorization.

28555693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324000, while the sum is 43.

The square root of 28555693 is about 5343.7527076017. The cubic root of 28555693 is about 305.6545755452.

The spelling of 28555693 in words is "twenty-eight million, five hundred fifty-five thousand, six hundred ninety-three".