26297680 has 20 divisors (see below), whose sum is σ = 61142292. Its totient is φ = 10519040.

The previous prime is 26297659. The next prime is 26297681. The reversal of 26297680 is 8679262.

It can be written as a sum of positive squares in 2 ways, for example, as 9290304 + 17007376 = 3048^2 + 4124^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26297681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164281 + ... + 164440.

Almost surely, 2^26297680 is an apocalyptic number.

26297680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26297680 is an abundant number, since it is smaller than the sum of its proper divisors (34844612).

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

26297680 is a wasteful number, since it uses less digits than its factorization.

26297680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328734 (or 328728 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 26297680 is about 5128.1263634977. The cubic root of 26297680 is about 297.3759292448.

The spelling of 26297680 in words is "twenty-six million, two hundred ninety-seven thousand, six hundred eighty".