26215440 has 80 divisors (see below), whose sum is σ = 85560000. Its totient is φ = 6621696.

The previous prime is 26215393. The next prime is 26215447. The reversal of 26215440 is 4451262.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 26215440.

It is not an unprimeable number, because it can be changed into a prime (26215447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1686 + ... + 7434.

It is an arithmetic number, because the mean of its divisors is an integer number (1069500).

Almost surely, 2^26215440 is an apocalyptic number.

26215440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26215440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42780000).

26215440 is an abundant number, since it is smaller than the sum of its proper divisors (59344560).

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

26215440 is a wasteful number, since it uses less digits than its factorization.

26215440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5784 (or 5778 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 26215440 is about 5120.1015614927. The cubic root of 26215440 is about 297.0656137273.

The spelling of 26215440 in words is "twenty-six million, two hundred fifteen thousand, four hundred forty".