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28081643677 is a prime number
BaseRepresentation
bin11010001001110010…
…111110000010011101
32200111001120022012221
4122021302332002131
5430002400044202
620522303025341
72012614014163
oct321162760235
980431508187
1028081643677
1110a003a058a
12553859b251
132856b05309
141505763233
15ae54e2037
hex689cbe09d

28081643677 has 2 divisors, whose sum is σ = 28081643678. Its totient is φ = 28081643676.

The previous prime is 28081643633. The next prime is 28081643701. The reversal of 28081643677 is 77634618082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21345502201 + 6736141476 = 146101^2 + 82074^2 .

It is a cyclic number.

It is not a de Polignac number, because 28081643677 - 27 = 28081643549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28081643627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14040821838 + 14040821839.

It is an arithmetic number, because the mean of its divisors is an integer number (14040821839).

Almost surely, 228081643677 is an apocalyptic number.

It is an amenable number.

28081643677 is a deficient number, since it is larger than the sum of its proper divisors (1).

28081643677 is an equidigital number, since it uses as much as digits as its factorization.

28081643677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2709504, while the sum is 52.

The spelling of 28081643677 in words is "twenty-eight billion, eighty-one million, six hundred forty-three thousand, six hundred seventy-seven".