28005877 has 2 divisors, whose sum is σ = 28005878. Its totient is φ = 28005876.

The previous prime is 28005869. The next prime is 28005907. The reversal of 28005877 is 77850082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20421361 + 7584516 = 4519^2 + 2754^2 .

It is a cyclic number.

It is not a de Polignac number, because 28005877 - 2³ = 28005869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28005847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14002938 + 14002939.

It is an arithmetic number, because the mean of its divisors is an integer number (14002939).

Almost surely, 2^28005877 is an apocalyptic number.

It is an amenable number.

28005877 is a deficient number, since it is larger than the sum of its proper divisors (1).

28005877 is an equidigital number, since it uses as much as digits as its factorization.

28005877 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31360, while the sum is 37.

The square root of 28005877 is about 5292.0579172946. The cubic root of 28005877 is about 303.6801409792.

It can be divided in two parts, 28005 and 877, that added together give a palindrome (28882).

The spelling of 28005877 in words is "twenty-eight million, five thousand, eight hundred seventy-seven".