26780401 has 4 divisors (see below), whose sum is σ = 26804592. Its totient is φ = 26756212.

The previous prime is 26780399. The next prime is 26780407. The reversal of 26780401 is 10408762.

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 not a de Polignac number, because 26780401 - 2¹ = 26780399 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26780401.

It is not an unprimeable number, because it can be changed into a prime (26780407) 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, 10351 + ... + 12676.

It is an arithmetic number, because the mean of its divisors is an integer number (6701148).

Almost surely, 2^26780401 is an apocalyptic number.

It is an amenable number.

26780401 is a deficient number, since it is larger than the sum of its proper divisors (24191).

26780401 is a wasteful number, since it uses less digits than its factorization.

26780401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24190.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 26780401 is about 5174.9783574427. The cubic root of 26780401 is about 299.1844553357.

It can be divided in two parts, 2 and 6780401, that added together give a triangular number (6780403 = T₃₆₈₂).

The spelling of 26780401 in words is "twenty-six million, seven hundred eighty thousand, four hundred one".