26990891 has 8 divisors (see below), whose sum is σ = 28218624. Its totient is φ = 25767720.

The previous prime is 26990879. The next prime is 26990923. The reversal of 26990891 is 19809962.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26990891 - 2⁶ = 26990827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26990861) 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, 17930 + ... + 19376.

It is an arithmetic number, because the mean of its divisors is an integer number (3527328).

Almost surely, 2^26990891 is an apocalyptic number.

26990891 is a deficient number, since it is larger than the sum of its proper divisors (1227733).

26990891 is a wasteful number, since it uses less digits than its factorization.

26990891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2281.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 26990891 is about 5195.2758348330. The cubic root of 26990891 is about 299.9662591683.

The spelling of 26990891 in words is "twenty-six million, nine hundred ninety thousand, eight hundred ninety-one".