28991419 has 2 divisors, whose sum is σ = 28991420. Its totient is φ = 28991418.

The previous prime is 28991407. The next prime is 28991437. The reversal of 28991419 is 91419982.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28991419 - 2¹⁷ = 28860347 is a prime.

It is a super-2 number, since 2×28991419² = 1681004751267122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28991449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14495709 + 14495710.

It is an arithmetic number, because the mean of its divisors is an integer number (14495710).

Almost surely, 2^28991419 is an apocalyptic number.

28991419 is a deficient number, since it is larger than the sum of its proper divisors (1).

28991419 is an equidigital number, since it uses as much as digits as its factorization.

28991419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 43.

The square root of 28991419 is about 5384.3680223402. The cubic root of 28991419 is about 307.2013766474.

The spelling of 28991419 in words is "twenty-eight million, nine hundred ninety-one thousand, four hundred nineteen".