28658887 has 2 divisors, whose sum is σ = 28658888. Its totient is φ = 28658886.

The previous prime is 28658879. The next prime is 28658891. The reversal of 28658887 is 78885682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28658887 - 2³ = 28658879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28658807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14329443 + 14329444.

It is an arithmetic number, because the mean of its divisors is an integer number (14329444).

Almost surely, 2^28658887 is an apocalyptic number.

28658887 is a deficient number, since it is larger than the sum of its proper divisors (1).

28658887 is an equidigital number, since it uses as much as digits as its factorization.

28658887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1720320, while the sum is 52.

The square root of 28658887 is about 5353.3995741024. The cubic root of 28658887 is about 306.0223224065.

The spelling of 28658887 in words is "twenty-eight million, six hundred fifty-eight thousand, eight hundred eighty-seven".