26287561 has 4 divisors (see below), whose sum is σ = 26302612. Its totient is φ = 26272512.

The previous prime is 26287553. The next prime is 26287567. The reversal of 26287561 is 16578262.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19527561 + 6760000 = 4419^2 + 2600^2 .

It is a cyclic number.

It is not a de Polignac number, because 26287561 - 2³ = 26287553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26287561.

It is not an unprimeable number, because it can be changed into a prime (26287567) 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, 4500 + ... + 8533.

It is an arithmetic number, because the mean of its divisors is an integer number (6575653).

Almost surely, 2^26287561 is an apocalyptic number.

It is an amenable number.

26287561 is a deficient number, since it is larger than the sum of its proper divisors (15051).

26287561 is a wasteful number, since it uses less digits than its factorization.

26287561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15050.

The product of its digits is 40320, while the sum is 37.

The square root of 26287561 is about 5127.1396509165. The cubic root of 26287561 is about 297.3377822413.

The spelling of 26287561 in words is "twenty-six million, two hundred eighty-seven thousand, five hundred sixty-one".