26128639 has 8 divisors (see below), whose sum is σ = 26593920. Its totient is φ = 25666200.

The previous prime is 26128637. The next prime is 26128693. The reversal of 26128639 is 93682162.

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

It is a cyclic number.

It is not a de Polignac number, because 26128639 - 2¹ = 26128637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26128598 and 26128607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26128631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26424 + ... + 27394.

It is an arithmetic number, because the mean of its divisors is an integer number (3324240).

Almost surely, 2^26128639 is an apocalyptic number.

26128639 is a deficient number, since it is larger than the sum of its proper divisors (465281).

26128639 is an equidigital number, since it uses as much as digits as its factorization.

26128639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1421.

The product of its digits is 31104, while the sum is 37.

The square root of 26128639 is about 5111.6180412859. The cubic root of 26128639 is about 296.7373834420.

It can be divided in two parts, 261 and 28639, that added together give a square (28900 = 170²).

The spelling of 26128639 in words is "twenty-six million, one hundred twenty-eight thousand, six hundred thirty-nine".