26191530 has 48 divisors (see below), whose sum is σ = 68445000. Its totient is φ = 6948864.

The previous prime is 26191513. The next prime is 26191531. The reversal of 26191530 is 3519162.

26191530 is a `hidden beast` number, since 2 + 619 + 15 + 30 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 16136289 + 10055241 = 4017^2 + 3171^2 .

It is a junction number, because it is equal to n+sod(n) for n = 26191494 and 26191503.

It is not an unprimeable number, because it can be changed into a prime (26191531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20346 + ... + 21594.

Almost surely, 2^26191530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26191530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34222500).

26191530 is an abundant number, since it is smaller than the sum of its proper divisors (42253470).

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

26191530 is a wasteful number, since it uses less digits than its factorization.

26191530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1495 (or 1492 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 26191530 is about 5117.7661142338. The cubic root of 26191530 is about 296.9752725732.

The spelling of 26191530 in words is "twenty-six million, one hundred ninety-one thousand, five hundred thirty".