26318640 has 40 divisors (see below), whose sum is σ = 81588528. Its totient is φ = 7018240.

The previous prime is 26318639. The next prime is 26318641. The reversal of 26318640 is 4681362.

It is an interprime number because it is at equal distance from previous prime (26318639) and next prime (26318641).

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×26318640² = 1385341622899200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 26318598 and 26318607.

It is not an unprimeable number, because it can be changed into a prime (26318641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54591 + ... + 55070.

Almost surely, 2^26318640 is an apocalyptic number.

26318640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26318640 is an abundant number, since it is smaller than the sum of its proper divisors (55269888).

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

26318640 is a wasteful number, since it uses less digits than its factorization.

26318640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109677 (or 109671 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 26318640 is about 5130.1695878402. The cubic root of 26318640 is about 297.4549139594.

The spelling of 26318640 in words is "twenty-six million, three hundred eighteen thousand, six hundred forty".