26287089520 has 20 divisors (see below), whose sum is σ = 61117483320. Its totient is φ = 10514835776.

The previous prime is 26287089503. The next prime is 26287089529. The reversal of 26287089520 is 2598078262.

It is a happy number.

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

It is a super-2 number, since 2×26287089520² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26287089529) 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, 164294230 + ... + 164294389.

It is an arithmetic number, because the mean of its divisors is an integer number (3055874166).

Almost surely, 2^26287089520 is an apocalyptic number.

26287089520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26287089520 is an abundant number, since it is smaller than the sum of its proper divisors (34830393800).

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

26287089520 is a wasteful number, since it uses less digits than its factorization.

26287089520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328588632 (or 328588626 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 26287089520 in words is "twenty-six billion, two hundred eighty-seven million, eighty-nine thousand, five hundred twenty".