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28219661 is a prime number
BaseRepresentation
bin110101110100…
…1100100001101
31222002201002122
41223221210031
524211012121
62444502325
7461602031
oct153514415
958081078
1028219661
1114a24938
12954a9a5
135b00832
143a681c1
1527265ab
hex1ae990d

28219661 has 2 divisors, whose sum is σ = 28219662. Its totient is φ = 28219660.

The previous prime is 28219613. The next prime is 28219673. The reversal of 28219661 is 16691282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27352900 + 866761 = 5230^2 + 931^2 .

It is a cyclic number.

It is not a de Polignac number, because 28219661 - 210 = 28218637 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 (28219601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14109830 + 14109831.

It is an arithmetic number, because the mean of its divisors is an integer number (14109831).

Almost surely, 228219661 is an apocalyptic number.

28219661 is the 2840-th centered heptagonal number.

It is an amenable number.

28219661 is a deficient number, since it is larger than the sum of its proper divisors (1).

28219661 is an equidigital number, since it uses as much as digits as its factorization.

28219661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 35.

The square root of 28219661 is about 5312.2180866376. The cubic root of 28219661 is about 304.4509013150.

The spelling of 28219661 in words is "twenty-eight million, two hundred nineteen thousand, six hundred sixty-one".