26639987 has 4 divisors (see below), whose sum is σ = 29061816. Its totient is φ = 24218160.

The previous prime is 26639971. The next prime is 26639989. The reversal of 26639987 is 78993662.

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

It is a cyclic number.

It is not a de Polignac number, because 26639987 - 2⁴ = 26639971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26639989) 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, 1210898 + ... + 1210919.

It is an arithmetic number, because the mean of its divisors is an integer number (7265454).

Almost surely, 2^26639987 is an apocalyptic number.

26639987 is a deficient number, since it is larger than the sum of its proper divisors (2421829).

26639987 is a wasteful number, since it uses less digits than its factorization.

26639987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2421828.

The product of its digits is 979776, while the sum is 50.

The square root of 26639987 is about 5161.3939008760. The cubic root of 26639987 is about 298.6606478700.

The spelling of 26639987 in words is "twenty-six million, six hundred thirty-nine thousand, nine hundred eighty-seven".