26679978 has 48 divisors (see below), whose sum is σ = 62866440. Its totient is φ = 8128512.

The previous prime is 26679949. The next prime is 26679979. The reversal of 26679978 is 87997662.

It can be written as a sum of positive squares in 4 ways, for example, as 7469289 + 19210689 = 2733^2 + 4383^2 .

It is not an unprimeable number, because it can be changed into a prime (26679979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25938 + ... + 26946.

Almost surely, 2^26679978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26679978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31433220).

26679978 is an abundant number, since it is smaller than the sum of its proper divisors (36186462).

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

26679978 is a wasteful number, since it uses less digits than its factorization.

26679978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143 (or 1140 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 26679978 is about 5165.2664984490. The cubic root of 26679978 is about 298.8100193949.

The spelling of 26679978 in words is "twenty-six million, six hundred seventy-nine thousand, nine hundred seventy-eight".