2660781 has 8 divisors (see below), whose sum is σ = 3643744. Its totient is φ = 1725840.

The previous prime is 2660773. The next prime is 2660783. The reversal of 2660781 is 1870662.

It is a happy number.

2660781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2660781 - 2³ = 2660773 is a prime.

It is a super-2 number, since 2×2660781² = 14159511059922, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2660783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11875 + ... + 12096.

It is an arithmetic number, because the mean of its divisors is an integer number (455468).

2^2660781 is an apocalyptic number.

It is an amenable number.

2660781 is a deficient number, since it is larger than the sum of its proper divisors (982963).

2660781 is a wasteful number, since it uses less digits than its factorization.

2660781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24011.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 2660781 is about 1631.1900563699. The cubic root of 2660781 is about 138.5701573858.

The spelling of 2660781 in words is "two million, six hundred sixty thousand, seven hundred eighty-one".