26506781 has 16 divisors (see below), whose sum is σ = 30942720. Its totient is φ = 22239360.

The previous prime is 26506771. The next prime is 26506801. The reversal of 26506781 is 18760562.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26506781 is a prime.

It is a super-2 number, since 2×26506781² = 1405218877963922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26506721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97676 + ... + 97946.

It is an arithmetic number, because the mean of its divisors is an integer number (1933920).

Almost surely, 2^26506781 is an apocalyptic number.

It is an amenable number.

26506781 is a deficient number, since it is larger than the sum of its proper divisors (4435939).

26506781 is a wasteful number, since it uses less digits than its factorization.

26506781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 26506781 is about 5148.4736573085. The cubic root of 26506781 is about 298.1620254577.

The spelling of 26506781 in words is "twenty-six million, five hundred six thousand, seven hundred eighty-one".