26661660 has 48 divisors (see below), whose sum is σ = 74898432. Its totient is φ = 7086400.

The previous prime is 26661647. The next prime is 26661683. The reversal of 26661660 is 6616662.

It is a super-2 number, since 2×26661660² = 1421688227911200, which contains 22 as substring.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 25345 + ... + 26375.

It is an arithmetic number, because the mean of its divisors is an integer number (1560384).

Almost surely, 2^26661660 is an apocalyptic number.

26661660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26661660 is an abundant number, since it is smaller than the sum of its proper divisors (48236772).

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

26661660 is a wasteful number, since it uses less digits than its factorization.

26661660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474 (or 1472 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 26661660 is about 5163.4930037718. The cubic root of 26661660 is about 298.7416178504.

The spelling of 26661660 in words is "twenty-six million, six hundred sixty-one thousand, six hundred sixty".