26327991 has 4 divisors (see below), whose sum is σ = 35103992. Its totient is φ = 17551992.

The previous prime is 26327981. The next prime is 26328011. The reversal of 26327991 is 19972362.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 26327991 - 2¹⁸ = 26065847 is a prime.

It is a super-2 number, since 2×26327991² = 1386326220192162, 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 (26327941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4387996 + ... + 4388001.

It is an arithmetic number, because the mean of its divisors is an integer number (8775998).

Almost surely, 2^26327991 is an apocalyptic number.

26327991 is a deficient number, since it is larger than the sum of its proper divisors (8776001).

26327991 is an equidigital number, since it uses as much as digits as its factorization.

26327991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8776000.

The product of its digits is 40824, while the sum is 39.

The square root of 26327991 is about 5131.0808802824. The cubic root of 26327991 is about 297.4901383168.

The spelling of 26327991 in words is "twenty-six million, three hundred twenty-seven thousand, nine hundred ninety-one".