28640419 has 2 divisors, whose sum is σ = 28640420. Its totient is φ = 28640418.

The previous prime is 28640407. The next prime is 28640453. The reversal of 28640419 is 91404682.

It is an a-pointer prime, because the next prime (28640453) can be obtained adding 28640419 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28640419 - 2⁵ = 28640387 is a prime.

It is a super-2 number, since 2×28640419² = 1640547200991122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28640119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14320209 + 14320210.

It is an arithmetic number, because the mean of its divisors is an integer number (14320210).

Almost surely, 2^28640419 is an apocalyptic number.

28640419 is a deficient number, since it is larger than the sum of its proper divisors (1).

28640419 is an equidigital number, since it uses as much as digits as its factorization.

28640419 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 28640419 is about 5351.6744108737. The cubic root of 28640419 is about 305.9565739277.

The spelling of 28640419 in words is "twenty-eight million, six hundred forty thousand, four hundred nineteen".