26640648 has 24 divisors (see below), whose sum is σ = 72151950. Its totient is φ = 8880192.

The previous prime is 26640643. The next prime is 26640659. The reversal of 26640648 is 84604662.

It is a happy number.

26640648 is a `hidden beast` number, since 2 + 6 + 6 + 4 + 0 + 648 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16793604 + 9847044 = 4098^2 + 3138^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-3 number, since 3×26640648³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (26640643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 184933 + ... + 185076.

Almost surely, 2^26640648 is an apocalyptic number.

It is an amenable number.

26640648 is an abundant number, since it is smaller than the sum of its proper divisors (45511302).

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

26640648 is a wasteful number, since it uses less digits than its factorization.

26640648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370021 (or 370014 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 26640648 is about 5161.4579335688. The cubic root of 26640648 is about 298.6631180045.

The spelling of 26640648 in words is "twenty-six million, six hundred forty thousand, six hundred forty-eight".