2791620 has 72 divisors (see below), whose sum is σ = 9126936. Its totient is φ = 686592.

The previous prime is 2791597. The next prime is 2791631. The reversal of 2791620 is 261972.

2791620 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 49284 + 2742336 = 222^2 + 1656^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1744 + ... + 2936.

It is an arithmetic number, because the mean of its divisors is an integer number (126763).

2^2791620 is an apocalyptic number.

2791620 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 2791620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4563468).

2791620 is an abundant number, since it is smaller than the sum of its proper divisors (6335316).

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

2791620 is a wasteful number, since it uses less digits than its factorization.

2791620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221 (or 1216 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 2791620 is about 1670.8141727912. The cubic root of 2791620 is about 140.8052237430.

The spelling of 2791620 in words is "two million, seven hundred ninety-one thousand, six hundred twenty".