26172690 has 128 divisors (see below), whose sum is σ = 72887040. Its totient is φ = 5971968.

The previous prime is 26172677. The next prime is 26172691. The reversal of 26172690 is 9627162.

It is a super-2 number, since 2×26172690² = 1370019403672200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26172691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 358494 + ... + 358566.

It is an arithmetic number, because the mean of its divisors is an integer number (569430).

Almost surely, 2^26172690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26172690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36443520).

26172690 is an abundant number, since it is smaller than the sum of its proper divisors (46714350).

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

26172690 is a wasteful number, since it uses less digits than its factorization.

26172690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 26172690 is about 5115.9251362779. The cubic root of 26172690 is about 296.9040490873.

It can be divided in two parts, 26172 and 690, that added together give a palindrome (26862).

The spelling of 26172690 in words is "twenty-six million, one hundred seventy-two thousand, six hundred ninety".