26009890 has 16 divisors (see below), whose sum is σ = 48083832. Its totient is φ = 10122624.

The previous prime is 26009873. The next prime is 26009891. The reversal of 26009890 is 9890062.

It can be written as a sum of positive squares in 4 ways, for example, as 25715041 + 294849 = 5071^2 + 543^2 .

It is not an unprimeable number, because it can be changed into a prime (26009891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34779 + ... + 35518.

Almost surely, 2^26009890 is an apocalyptic number.

26009890 is a deficient number, since it is larger than the sum of its proper divisors (22073942).

26009890 is a wasteful number, since it uses less digits than its factorization.

26009890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70341.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 26009890 is about 5099.9892156749. The cubic root of 26009890 is about 296.2871650099.

The spelling of 26009890 in words is "twenty-six million, nine thousand, eight hundred ninety".