28078487 has 2 divisors, whose sum is σ = 28078488. Its totient is φ = 28078486.

The previous prime is 28078471. The next prime is 28078541. The reversal of 28078487 is 78487082.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28078487 - 2⁴ = 28078471 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28078387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14039243 + 14039244.

It is an arithmetic number, because the mean of its divisors is an integer number (14039244).

Almost surely, 2^28078487 is an apocalyptic number.

28078487 is a deficient number, since it is larger than the sum of its proper divisors (1).

28078487 is an equidigital number, since it uses as much as digits as its factorization.

28078487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 200704, while the sum is 44.

The square root of 28078487 is about 5298.9137566109. The cubic root of 28078487 is about 303.9423619662.

The spelling of 28078487 in words is "twenty-eight million, seventy-eight thousand, four hundred eighty-seven".