27278026129 has 8 divisors (see below), whose sum is σ = 27308221640. Its totient is φ = 27247850496.

The previous prime is 27278026123. The next prime is 27278026147. The reversal of 27278026129 is 92162087272.

It can be written as a sum of positive squares in 4 ways, for example, as 4003472529 + 23274553600 = 63273^2 + 152560^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 3-Lehmer number, since φ(27278026129) divides (27278026129-1)³.

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 27278026129 - 2¹³ = 27278017937 is a prime.

It is a deceptive number, since it divides R_27278026128.

It is not an unprimeable number, because it can be changed into a prime (27278026123) by changing a digit.

It is a Zeisel number, with parameters (1, 1656).

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5487157 + ... + 5492125.

It is an arithmetic number, because the mean of its divisors is an integer number (3413527705).

It is a Poulet number, since it divides 2^27278026128-1.

Almost surely, 2^27278026129 is an apocalyptic number.

It is an amenable number.

27278026129 is a deficient number, since it is larger than the sum of its proper divisors (30195511).

27278026129 is a wasteful number, since it uses less digits than its factorization.

27278026129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9939.

The product of its (nonzero) digits is 338688, while the sum is 46.

The spelling of 27278026129 in words is "twenty-seven billion, two hundred seventy-eight million, twenty-six thousand, one hundred twenty-nine".