26778906 has 72 divisors (see below), whose sum is σ = 72861984. Its totient is φ = 6905520.

The previous prime is 26778883. The next prime is 26778911. The reversal of 26778906 is 60987762.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 192585 + ... + 192723.

It is an arithmetic number, because the mean of its divisors is an integer number (1011972).

Almost surely, 2^26778906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26778906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36430992).

26778906 is an abundant number, since it is smaller than the sum of its proper divisors (46083078).

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

26778906 is a wasteful number, since it uses less digits than its factorization.

26778906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 26778906 is about 5174.8339103782. The cubic root of 26778906 is about 299.1788879672.

Subtracting 26778906 from its reverse (60987762), we obtain a triangular number (34208856 = T₈₂₇₁).

The spelling of 26778906 in words is "twenty-six million, seven hundred seventy-eight thousand, nine hundred six".