26661798 has 40 divisors (see below), whose sum is σ = 61680960. Its totient is φ = 8598960.

The previous prime is 26661781. The next prime is 26661799. The reversal of 26661798 is 89716662.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26661799) 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, 2368 + ... + 7676.

It is an arithmetic number, because the mean of its divisors is an integer number (1542024).

Almost surely, 2^26661798 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26661798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30840480).

26661798 is an abundant number, since it is smaller than the sum of its proper divisors (35019162).

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

26661798 is a wasteful number, since it uses less digits than its factorization.

26661798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5354 (or 5345 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 26661798 is about 5163.5063668015. The cubic root of 26661798 is about 298.7421332756.

The spelling of 26661798 in words is "twenty-six million, six hundred sixty-one thousand, seven hundred ninety-eight".