26878765 has 4 divisors (see below), whose sum is σ = 32254524. Its totient is φ = 21503008.

The previous prime is 26878759. The next prime is 26878769. The reversal of 26878765 is 56787862.

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 10982596 + 15896169 = 3314^2 + 3987^2 .

It is a cyclic number.

It is not a de Polignac number, because 26878765 - 2²¹ = 24781613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26878769) 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, 2687872 + ... + 2687881.

It is an arithmetic number, because the mean of its divisors is an integer number (8063631).

Almost surely, 2^26878765 is an apocalyptic number.

It is an amenable number.

26878765 is a deficient number, since it is larger than the sum of its proper divisors (5375759).

26878765 is an equidigital number, since it uses as much as digits as its factorization.

26878765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5375758.

The product of its digits is 1128960, while the sum is 49.

The square root of 26878765 is about 5184.4734544600. The cubic root of 26878765 is about 299.5503077412.

The spelling of 26878765 in words is "twenty-six million, eight hundred seventy-eight thousand, seven hundred sixty-five".