26497890 has 96 divisors (see below), whose sum is σ = 72648576. Its totient is φ = 6693120.

The previous prime is 26497873. The next prime is 26497921. The reversal of 26497890 is 9879462.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 158587 + ... + 158753.

It is an arithmetic number, because the mean of its divisors is an integer number (756756).

Almost surely, 2^26497890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26497890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36324288).

26497890 is an abundant number, since it is smaller than the sum of its proper divisors (46150686).

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

26497890 is a wasteful number, since it uses less digits than its factorization.

26497890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264 (or 261 counting only the distinct ones).

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

The square root of 26497890 is about 5147.6101250969. The cubic root of 26497890 is about 298.1286848693.

The spelling of 26497890 in words is "twenty-six million, four hundred ninety-seven thousand, eight hundred ninety".