28949969 has 2 divisors, whose sum is σ = 28949970. Its totient is φ = 28949968.

The previous prime is 28949959. The next prime is 28949971. The reversal of 28949969 is 96994982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15171025 + 13778944 = 3895^2 + 3712^2 .

It is a cyclic number.

It is not a de Polignac number, because 28949969 - 2⁴ = 28949953 is a prime.

It is a super-2 number, since 2×28949969² = 1676201410201922, which contains 22 as substring.

Together with 28949971, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28949909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14474984 + 14474985.

It is an arithmetic number, because the mean of its divisors is an integer number (14474985).

Almost surely, 2^28949969 is an apocalyptic number.

It is an amenable number.

28949969 is a deficient number, since it is larger than the sum of its proper divisors (1).

28949969 is an equidigital number, since it uses as much as digits as its factorization.

28949969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 56.

The square root of 28949969 is about 5380.5175401628. The cubic root of 28949969 is about 307.0549014624.

The spelling of 28949969 in words is "twenty-eight million, nine hundred forty-nine thousand, nine hundred sixty-nine".