26640513 has 12 divisors (see below), whose sum is σ = 40744548. Its totient is φ = 16715520.

The previous prime is 26640511. The next prime is 26640533. The reversal of 26640513 is 31504662.

26640513 is a `hidden beast` number, since 2 + 6 + 640 + 5 + 13 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13593969 + 13046544 = 3687^2 + 3612^2 .

It is not a de Polignac number, because 26640513 - 2¹ = 26640511 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26640511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86908 + ... + 87213.

It is an arithmetic number, because the mean of its divisors is an integer number (3395379).

Almost surely, 2^26640513 is an apocalyptic number.

It is an amenable number.

26640513 is a deficient number, since it is larger than the sum of its proper divisors (14104035).

26640513 is a wasteful number, since it uses less digits than its factorization.

26640513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174144 (or 174141 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 26640513 is about 5161.4448558519. Note that the first 3 decimals coincide. The cubic root of 26640513 is about 298.6626135174.

The spelling of 26640513 in words is "twenty-six million, six hundred forty thousand, five hundred thirteen".