26851890 has 64 divisors (see below), whose sum is σ = 71672832. Its totient is φ = 6393600.

The previous prime is 26851873. The next prime is 26851919. The reversal of 26851890 is 9815862.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 10980 + ... + 13200.

It is an arithmetic number, because the mean of its divisors is an integer number (1119888).

Almost surely, 2^26851890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26851890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35836416).

26851890 is an abundant number, since it is smaller than the sum of its proper divisors (44820942).

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

26851890 is a wasteful number, since it uses less digits than its factorization.

26851890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2275.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 26851890 is about 5181.8809326344. The cubic root of 26851890 is about 299.4504383324.

The spelling of 26851890 in words is "twenty-six million, eight hundred fifty-one thousand, eight hundred ninety".