2720520 has 128 divisors (see below), whose sum is σ = 9936000. Its totient is φ = 656640.

The previous prime is 2720513. The next prime is 2720551. The reversal of 2720520 is 250272.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2720493 and 2720502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11766 + ... + 11994.

It is an arithmetic number, because the mean of its divisors is an integer number (77625).

2^2720520 is an apocalyptic number.

2720520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2720520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4968000).

2720520 is an abundant number, since it is smaller than the sum of its proper divisors (7215480).

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

2720520 is a wasteful number, since it uses less digits than its factorization.

2720520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 18.

The square root of 2720520 is about 1649.3998908694. The cubic root of 2720520 is about 139.5995358534.

Adding to 2720520 its reverse (250272), we get a palindrome (2970792).

It can be divided in two parts, 27205 and 20, that added together give a square (27225 = 165²).

The spelling of 2720520 in words is "two million, seven hundred twenty thousand, five hundred twenty".