26240240 has 80 divisors (see below), whose sum is σ = 68620608. Its totient is φ = 9259008.

The previous prime is 26240239. The next prime is 26240243. The reversal of 26240240 is 4204262.

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 (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26240243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23372 + ... + 24468.

Almost surely, 2^26240240 is an apocalyptic number.

26240240 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 26240240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34310304).

26240240 is an abundant number, since it is smaller than the sum of its proper divisors (42380368).

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

26240240 is a wasteful number, since it uses less digits than its factorization.

26240240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146 (or 1140 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 26240240 is about 5122.5228159570. The cubic root of 26240240 is about 297.1592596257.

The spelling of 26240240 in words is "twenty-six million, two hundred forty thousand, two hundred forty".