26306991 has 16 divisors (see below), whose sum is σ = 39525120. Its totient is φ = 17289720.

The previous prime is 26306983. The next prime is 26306999. The reversal of 26306991 is 19960362.

It is an interprime number because it is at equal distance from previous prime (26306983) and next prime (26306999).

It is not a de Polignac number, because 26306991 - 2³ = 26306983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26306999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4945 + ... + 8778.

It is an arithmetic number, because the mean of its divisors is an integer number (2470320).

Almost surely, 2^26306991 is an apocalyptic number.

26306991 is a deficient number, since it is larger than the sum of its proper divisors (13218129).

26306991 is a wasteful number, since it uses less digits than its factorization.

26306991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13803 (or 13797 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 26306991 is about 5129.0341195980. The cubic root of 26306991 is about 297.4110215743.

The spelling of 26306991 in words is "twenty-six million, three hundred six thousand, nine hundred ninety-one".