26987920 has 20 divisors (see below), whose sum is σ = 62747100. Its totient is φ = 10795136.

The previous prime is 26987899. The next prime is 26987929. The reversal of 26987920 is 2978962.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18249984 + 8737936 = 4272^2 + 2956^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168595 + ... + 168754.

It is an arithmetic number, because the mean of its divisors is an integer number (3137355).

Almost surely, 2^26987920 is an apocalyptic number.

26987920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26987920 is an abundant number, since it is smaller than the sum of its proper divisors (35759180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26987920 is a wasteful number, since it uses less digits than its factorization.

26987920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337362 (or 337356 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 26987920 is about 5194.9898941191. The cubic root of 26987920 is about 299.9552525852.

The spelling of 26987920 in words is "twenty-six million, nine hundred eighty-seven thousand, nine hundred twenty".