26981565 has 32 divisors (see below), whose sum is σ = 46811520. Its totient is φ = 13191936.

The previous prime is 26981551. The next prime is 26981569. The reversal of 26981565 is 56518962.

It is not a de Polignac number, because 26981565 - 2²³ = 18592957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26981569) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34519 + ... + 35291.

It is an arithmetic number, because the mean of its divisors is an integer number (1462860).

Almost surely, 2^26981565 is an apocalyptic number.

It is an amenable number.

26981565 is a deficient number, since it is larger than the sum of its proper divisors (19829955).

26981565 is a wasteful number, since it uses less digits than its factorization.

26981565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973.

The product of its digits is 129600, while the sum is 42.

The square root of 26981565 is about 5194.3782111048. The cubic root of 26981565 is about 299.9317066768.

The spelling of 26981565 in words is "twenty-six million, nine hundred eighty-one thousand, five hundred sixty-five".