26640890 has 8 divisors (see below), whose sum is σ = 47953620. Its totient is φ = 10656352.

The previous prime is 26640829. The next prime is 26640893. The reversal of 26640890 is 9804662.

It can be written as a sum of positive squares in 2 ways, for example, as 22005481 + 4635409 = 4691^2 + 2153^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 26640890.

It is not an unprimeable number, because it can be changed into a prime (26640893) 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 3 ways as a sum of consecutive naturals, for example, 1332035 + ... + 1332054.

Almost surely, 2^26640890 is an apocalyptic number.

26640890 is a deficient number, since it is larger than the sum of its proper divisors (21312730).

26640890 is a wasteful number, since it uses less digits than its factorization.

26640890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2664096.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 26640890 is about 5161.4813765042. The cubic root of 26640890 is about 298.6640223401.

The spelling of 26640890 in words is "twenty-six million, six hundred forty thousand, eight hundred ninety".