26091987 has 16 divisors (see below), whose sum is σ = 36160512. Its totient is φ = 16716960.

The previous prime is 26091979. The next prime is 26092007. The reversal of 26091987 is 78919062.

It is not a de Polignac number, because 26091987 - 2³ = 26091979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26091907) 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, 13708 + ... + 15494.

It is an arithmetic number, because the mean of its divisors is an integer number (2260032).

Almost surely, 2^26091987 is an apocalyptic number.

26091987 is a deficient number, since it is larger than the sum of its proper divisors (10068525).

26091987 is a wasteful number, since it uses less digits than its factorization.

26091987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 26091987 is about 5108.0316169734. The cubic root of 26091987 is about 296.5985688639.

The spelling of 26091987 in words is "twenty-six million, ninety-one thousand, nine hundred eighty-seven".