28788407 has 2 divisors, whose sum is σ = 28788408. Its totient is φ = 28788406.

The previous prime is 28788377. The next prime is 28788413. The reversal of 28788407 is 70488782.

It is a happy number.

28788407 is nontrivially palindromic in base 15.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28788407 - 2⁶ = 28788343 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 (28788007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14394203 + 14394204.

It is an arithmetic number, because the mean of its divisors is an integer number (14394204).

Almost surely, 2^28788407 is an apocalyptic number.

28788407 is a deficient number, since it is larger than the sum of its proper divisors (1).

28788407 is an equidigital number, since it uses as much as digits as its factorization.

28788407 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 28788407 is about 5365.4829232791. The cubic root of 28788407 is about 306.4826386170.

The spelling of 28788407 in words is "twenty-eight million, seven hundred eighty-eight thousand, four hundred seven".