26660172 has 144 divisors (see below), whose sum is σ = 81272576. Its totient is φ = 6652800.

The previous prime is 26660147. The next prime is 26660191. The reversal of 26660172 is 27106662.

It is a super-3 number, since 3×26660172³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 437022 + ... + 437082.

Almost surely, 2^26660172 is an apocalyptic number.

26660172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26660172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40636288).

26660172 is an abundant number, since it is smaller than the sum of its proper divisors (54612404).

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

26660172 is a wasteful number, since it uses less digits than its factorization.

26660172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 26660172 is about 5163.3489132539. The cubic root of 26660172 is about 298.7360601095.

The spelling of 26660172 in words is "twenty-six million, six hundred sixty thousand, one hundred seventy-two".