26561500 has 48 divisors (see below), whose sum is σ = 66306240. Its totient is φ = 9105600.

The previous prime is 26561473. The next prime is 26561501. The reversal of 26561500 is 516562.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26561501) 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, 295 + ... + 7294.

It is an arithmetic number, because the mean of its divisors is an integer number (1381380).

Almost surely, 2^26561500 is an apocalyptic number.

26561500 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 26561500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33153120).

26561500 is an abundant number, since it is smaller than the sum of its proper divisors (39744740).

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

26561500 is a wasteful number, since it uses less digits than its factorization.

26561500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7615 (or 7603 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 26561500 is about 5153.7850168590. The cubic root of 26561500 is about 298.3670536739.

The spelling of 26561500 in words is "twenty-six million, five hundred sixty-one thousand, five hundred".