28799857 has 2 divisors, whose sum is σ = 28799858. Its totient is φ = 28799856.

The previous prime is 28799833. The next prime is 28799863. The reversal of 28799857 is 75899782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28740321 + 59536 = 5361^2 + 244^2 .

It is a cyclic number.

It is not a de Polignac number, because 28799857 - 2¹¹ = 28797809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28799798 and 28799807.

It is not a weakly prime, because it can be changed into another prime (28799807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14399928 + 14399929.

It is an arithmetic number, because the mean of its divisors is an integer number (14399929).

Almost surely, 2^28799857 is an apocalyptic number.

It is an amenable number.

28799857 is a deficient number, since it is larger than the sum of its proper divisors (1).

28799857 is an equidigital number, since it uses as much as digits as its factorization.

28799857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 55.

The square root of 28799857 is about 5366.5498227446. The cubic root of 28799857 is about 306.5232656314.

The spelling of 28799857 in words is "twenty-eight million, seven hundred ninety-nine thousand, eight hundred fifty-seven".