26721345 has 16 divisors (see below), whose sum is σ = 48862080. Its totient is φ = 12215424.

The previous prime is 26721341. The next prime is 26721371. The reversal of 26721345 is 54312762.

It is not a de Polignac number, because 26721345 - 2² = 26721341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26721341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127140 + ... + 127349.

It is an arithmetic number, because the mean of its divisors is an integer number (3053880).

Almost surely, 2^26721345 is an apocalyptic number.

It is an amenable number.

26721345 is a deficient number, since it is larger than the sum of its proper divisors (22140735).

26721345 is a wasteful number, since it uses less digits than its factorization.

26721345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254504.

The product of its digits is 10080, while the sum is 30.

The square root of 26721345 is about 5169.2692907219. The cubic root of 26721345 is about 298.9643734840.

It can be divided in two parts, 267 and 21345, that added together give a palindrome (21612).

The spelling of 26721345 in words is "twenty-six million, seven hundred twenty-one thousand, three hundred forty-five".