2720305 has 8 divisors (see below), whose sum is σ = 3730752. Its totient is φ = 1865328.

The previous prime is 2720303. The next prime is 2720321. The reversal of 2720305 is 5030272.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2720305 - 2¹ = 2720303 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2720303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38827 + ... + 38896.

It is an arithmetic number, because the mean of its divisors is an integer number (466344).

2^2720305 is an apocalyptic number.

It is an amenable number.

2720305 is a deficient number, since it is larger than the sum of its proper divisors (1010447).

2720305 is an equidigital number, since it uses as much as digits as its factorization.

2720305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77735.

The product of its (nonzero) digits is 420, while the sum is 19.

The square root of 2720305 is about 1649.3347143621. The cubic root of 2720305 is about 139.5958582855.

Adding to 2720305 its reverse (5030272), we get a palindrome (7750577).

It can be divided in two parts, 2720 and 305, that added together give a square (3025 = 55²).

The spelling of 2720305 in words is "two million, seven hundred twenty thousand, three hundred five".