28972919 has 2 divisors, whose sum is σ = 28972920. Its totient is φ = 28972918.

The previous prime is 28972907. The next prime is 28972969. The reversal of 28972919 is 91927982.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28972919 - 2⁴ = 28972903 is a prime.

It is a super-2 number, since 2×28972919² = 1678860070761122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28972969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14486459 + 14486460.

It is an arithmetic number, because the mean of its divisors is an integer number (14486460).

Almost surely, 2^28972919 is an apocalyptic number.

28972919 is a deficient number, since it is larger than the sum of its proper divisors (1).

28972919 is an equidigital number, since it uses as much as digits as its factorization.

28972919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 47.

The square root of 28972919 is about 5382.6498121279. The cubic root of 28972919 is about 307.1360189778.

The spelling of 28972919 in words is "twenty-eight million, nine hundred seventy-two thousand, nine hundred nineteen".