2928661 has 4 divisors (see below), whose sum is σ = 3007852. Its totient is φ = 2849472.

The previous prime is 2928647. The next prime is 2928677. The reversal of 2928661 is 1668292.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2464900 + 463761 = 1570^2 + 681^2 .

It is a cyclic number.

It is not a de Polignac number, because 2928661 - 2¹³ = 2920469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2928691) 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, 39540 + ... + 39613.

It is an arithmetic number, because the mean of its divisors is an integer number (751963).

2^2928661 is an apocalyptic number.

It is an amenable number.

2928661 is a deficient number, since it is larger than the sum of its proper divisors (79191).

2928661 is an equidigital number, since it uses as much as digits as its factorization.

2928661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79190.

The product of its digits is 10368, while the sum is 34.

The square root of 2928661 is about 1711.3331060901. Note that the first 3 decimals coincide. The cubic root of 2928661 is about 143.0725665565.

The spelling of 2928661 in words is "two million, nine hundred twenty-eight thousand, six hundred sixty-one".