26987999 has 6 divisors (see below), whose sum is σ = 28483560. Its totient is φ = 25567236.

The previous prime is 26987981. The next prime is 26988089. The reversal of 26987999 is 99978962.

It is a de Polignac number, because none of the positive numbers 2^k-26987999 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26987929) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37019 + ... + 37740.

It is an arithmetic number, because the mean of its divisors is an integer number (4747260).

Almost surely, 2^26987999 is an apocalyptic number.

26987999 is a deficient number, since it is larger than the sum of its proper divisors (1495561).

26987999 is an equidigital number, since it uses as much as digits as its factorization.

26987999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74797 (or 74778 counting only the distinct ones).

The product of its digits is 4408992, while the sum is 59.

The square root of 26987999 is about 5194.9974975932. The cubic root of 26987999 is about 299.9555452648.

The spelling of 26987999 in words is "twenty-six million, nine hundred eighty-seven thousand, nine hundred ninety-nine".