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28069997 is a prime number
BaseRepresentation
bin110101100010…
…1000001101101
31221211002210112
41223011001231
524141214442
62441345405
7460406504
oct153050155
957732715
1028069997
111493244a
129498265
135a7a687
143a2983b
1526e7082
hex1ac506d

28069997 has 2 divisors, whose sum is σ = 28069998. Its totient is φ = 28069996.

The previous prime is 28069981. The next prime is 28070047. The reversal of 28069997 is 79996082.

It is an a-pointer prime, because the next prime (28070047) can be obtained adding 28069997 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27678121 + 391876 = 5261^2 + 626^2 .

It is a cyclic number.

It is not a de Polignac number, because 28069997 - 24 = 28069981 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 (28069597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14034998 + 14034999.

It is an arithmetic number, because the mean of its divisors is an integer number (14034999).

Almost surely, 228069997 is an apocalyptic number.

It is an amenable number.

28069997 is a deficient number, since it is larger than the sum of its proper divisors (1).

28069997 is an equidigital number, since it uses as much as digits as its factorization.

28069997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 28069997 is about 5298.1125884602. The cubic root of 28069997 is about 303.9117248598.

The spelling of 28069997 in words is "twenty-eight million, sixty-nine thousand, nine hundred ninety-seven".