2790661 has 4 divisors (see below), whose sum is σ = 2799424. Its totient is φ = 2781900.

The previous prime is 2790653. The next prime is 2790673. The reversal of 2790661 is 1660972.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2790661 - 2³ = 2790653 is a prime.

It is a Duffinian number.

2790661 is a lucky number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2790461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3885 + ... + 4546.

It is an arithmetic number, because the mean of its divisors is an integer number (699856).

2^2790661 is an apocalyptic number.

It is an amenable number.

2790661 is a deficient number, since it is larger than the sum of its proper divisors (8763).

2790661 is an equidigital number, since it uses as much as digits as its factorization.

2790661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8762.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 2790661 is about 1670.5271623054. The cubic root of 2790661 is about 140.7890983779.

The spelling of 2790661 in words is "two million, seven hundred ninety thousand, six hundred sixty-one".