26780789 has 4 divisors (see below), whose sum is σ = 30606624. Its totient is φ = 22954956.

The previous prime is 26780783. The next prime is 26780791. The reversal of 26780789 is 98708762.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26780789 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 (26780783) 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, 1912907 + ... + 1912920.

It is an arithmetic number, because the mean of its divisors is an integer number (7651656).

Almost surely, 2^26780789 is an apocalyptic number.

It is an amenable number.

26780789 is a deficient number, since it is larger than the sum of its proper divisors (3825835).

26780789 is an equidigital number, since it uses as much as digits as its factorization.

26780789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3825834.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 26780789 is about 5175.0158453864. The cubic root of 26780789 is about 299.1859002109.

The spelling of 26780789 in words is "twenty-six million, seven hundred eighty thousand, seven hundred eighty-nine".