26680729 has 4 divisors (see below), whose sum is σ = 27118180. Its totient is φ = 26243280.

The previous prime is 26680727. The next prime is 26680741. The reversal of 26680729 is 92708662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2474329 + 24206400 = 1573^2 + 4920^2 .

It is a cyclic number.

It is not a de Polignac number, because 26680729 - 2¹ = 26680727 is a prime.

It is a super-2 number, since 2×26680729² = 1423722599942882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26680691 and 26680700.

It is not an unprimeable number, because it can be changed into a prime (26680721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218634 + ... + 218755.

It is an arithmetic number, because the mean of its divisors is an integer number (6779545).

Almost surely, 2^26680729 is an apocalyptic number.

It is an amenable number.

26680729 is a deficient number, since it is larger than the sum of its proper divisors (437451).

26680729 is an equidigital number, since it uses as much as digits as its factorization.

26680729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437450.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 26680729 is about 5165.3391950578. The cubic root of 26680729 is about 298.8128230481.

The spelling of 26680729 in words is "twenty-six million, six hundred eighty thousand, seven hundred twenty-nine".