26720865 has 24 divisors (see below), whose sum is σ = 46536360. Its totient is φ = 14183424.

The previous prime is 26720857. The next prime is 26720893. The reversal of 26720865 is 56802762.

It can be written as a sum of positive squares in 4 ways, for example, as 9381969 + 17338896 = 3063^2 + 4164^2 .

It is not a de Polignac number, because 26720865 - 2³ = 26720857 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9009 + ... + 11601.

It is an arithmetic number, because the mean of its divisors is an integer number (1939015).

Almost surely, 2^26720865 is an apocalyptic number.

It is an amenable number.

26720865 is a deficient number, since it is larger than the sum of its proper divisors (19815495).

26720865 is a wasteful number, since it uses less digits than its factorization.

26720865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2833 (or 2830 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 26720865 is about 5169.2228622879. Note that the first 3 decimals coincide. The cubic root of 26720865 is about 298.9625833576.

The spelling of 26720865 in words is "twenty-six million, seven hundred twenty thousand, eight hundred sixty-five".