26978447 has 4 divisors (see below), whose sum is σ = 26993400. Its totient is φ = 26963496.

The previous prime is 26978437. The next prime is 26978449. The reversal of 26978447 is 74487962.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74487962 = 2 ⋅37243981.

It is a cyclic number.

It is not a de Polignac number, because 26978447 - 2⁶ = 26978383 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 (26978449) 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, 4328 + ... + 8525.

It is an arithmetic number, because the mean of its divisors is an integer number (6748350).

Almost surely, 2^26978447 is an apocalyptic number.

26978447 is a deficient number, since it is larger than the sum of its proper divisors (14953).

26978447 is a wasteful number, since it uses less digits than its factorization.

26978447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14952.

The product of its digits is 677376, while the sum is 47.

The square root of 26978447 is about 5194.0780702643. The cubic root of 26978447 is about 299.9201528241.

The spelling of 26978447 in words is "twenty-six million, nine hundred seventy-eight thousand, four hundred forty-seven".