26161590 has 144 divisors (see below), whose sum is σ = 80840592. Its totient is φ = 5370624.

The previous prime is 26161573. The next prime is 26161591. The reversal of 26161590 is 9516162.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26161591) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 707052 + ... + 707088.

It is an arithmetic number, because the mean of its divisors is an integer number (561393).

Almost surely, 2^26161590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26161590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40420296).

26161590 is an abundant number, since it is smaller than the sum of its proper divisors (54679002).

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

26161590 is a wasteful number, since it uses less digits than its factorization.

26161590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 26161590 is about 5114.8401734561. The cubic root of 26161590 is about 296.8620702033.

The spelling of 26161590 in words is "twenty-six million, one hundred sixty-one thousand, five hundred ninety".