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28618637 is a prime number
BaseRepresentation
bin110110100101…
…0111110001101
31222211222101112
41231022332031
524311244022
62501221405
7465153155
oct155127615
958758345
1028618637
1115177673
129701865
135c10308
143b2d765
1527a48e2
hex1b4af8d

28618637 has 2 divisors, whose sum is σ = 28618638. Its totient is φ = 28618636.

The previous prime is 28618631. The next prime is 28618643. The reversal of 28618637 is 73681682.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (28618631) and next prime (28618643).

It can be written as a sum of positive squares in only one way, i.e., 16410601 + 12208036 = 4051^2 + 3494^2 .

It is a cyclic number.

It is not a de Polignac number, because 28618637 - 216 = 28553101 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28618594 and 28618603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28618631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14309318 + 14309319.

It is an arithmetic number, because the mean of its divisors is an integer number (14309319).

Almost surely, 228618637 is an apocalyptic number.

It is an amenable number.

28618637 is a deficient number, since it is larger than the sum of its proper divisors (1).

28618637 is an equidigital number, since it uses as much as digits as its factorization.

28618637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 41.

The square root of 28618637 is about 5349.6389597804. The cubic root of 28618637 is about 305.8789908415.

The spelling of 28618637 in words is "twenty-eight million, six hundred eighteen thousand, six hundred thirty-seven".