28081643701 has 2 divisors, whose sum is σ = 28081643702. Its totient is φ = 28081643700.

The previous prime is 28081643677. The next prime is 28081643741. The reversal of 28081643701 is 10734618082.

It is an a-pointer prime, because the next prime (28081643741) can be obtained adding 28081643701 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27910714225 + 170929476 = 167065^2 + 13074^2 .

It is a cyclic number.

It is not a de Polignac number, because 28081643701 - 2¹⁷ = 28081512629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28081643741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14040821850 + 14040821851.

It is an arithmetic number, because the mean of its divisors is an integer number (14040821851).

Almost surely, 2^28081643701 is an apocalyptic number.

It is an amenable number.

28081643701 is a deficient number, since it is larger than the sum of its proper divisors (1).

28081643701 is an equidigital number, since it uses as much as digits as its factorization.

28081643701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 28081643701 in words is "twenty-eight billion, eighty-one million, six hundred forty-three thousand, seven hundred one".