26217540 has 96 divisors (see below), whose sum is σ = 83381760. Its totient is φ = 6835968.

The previous prime is 26217533. The next prime is 26217551. The reversal of 26217540 is 4571262.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24864 + ... + 25896.

It is an arithmetic number, because the mean of its divisors is an integer number (868560).

Almost surely, 2^26217540 is an apocalyptic number.

26217540 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 26217540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41690880).

26217540 is an abundant number, since it is smaller than the sum of its proper divisors (57164220).

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

26217540 is a wasteful number, since it uses less digits than its factorization.

26217540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098 (or 1090 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 26217540 is about 5120.3066314431. The cubic root of 26217540 is about 297.0735457085.

The spelling of 26217540 in words is "twenty-six million, two hundred seventeen thousand, five hundred forty".