26816640 has 64 divisors (see below), whose sum is σ = 85484160. Its totient is φ = 7150592.

The previous prime is 26816639. The next prime is 26816641. The reversal of 26816640 is 4661862.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (26816639) and next prime (26816641).

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (26816641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5064 + ... + 8903.

It is an arithmetic number, because the mean of its divisors is an integer number (1335690).

Almost surely, 2^26816640 is an apocalyptic number.

26816640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26816640 is an abundant number, since it is smaller than the sum of its proper divisors (58667520).

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

26816640 is a wasteful number, since it uses less digits than its factorization.

26816640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13989 (or 13977 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 26816640 is about 5178.4785410389. The cubic root of 26816640 is about 299.3193457562.

The spelling of 26816640 in words is "twenty-six million, eight hundred sixteen thousand, six hundred forty".