26886978 has 40 divisors (see below), whose sum is σ = 60583248. Its totient is φ = 8949204.

The previous prime is 26886971. The next prime is 26886991. The reversal of 26886978 is 87968862.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (26886971) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 39025 + ... + 39707.

Almost surely, 2^26886978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26886978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30291624).

26886978 is an abundant number, since it is smaller than the sum of its proper divisors (33696270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26886978 is an frugal number, since it uses more digits than its factorization.

26886978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712 (or 688 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 26886978 is about 5185.2654705425. The cubic root of 26886978 is about 299.5808145513.

The spelling of 26886978 in words is "twenty-six million, eight hundred eighty-six thousand, nine hundred seventy-eight".