2756840 has 32 divisors (see below), whose sum is σ = 6357960. Its totient is φ = 1075840.

The previous prime is 2756821. The next prime is 2756869. The reversal of 2756840 is 486572.

It can be written as a sum of positive squares in 4 ways, for example, as 47524 + 2709316 = 218^2 + 1646^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2756797 and 2756806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67220 + ... + 67260.

2^2756840 is an apocalyptic number.

2756840 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 2756840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3178980).

2756840 is an abundant number, since it is smaller than the sum of its proper divisors (3601120).

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

2756840 is an frugal number, since it uses more digits than its factorization.

2756840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 48 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 2756840 is about 1660.3734519680. The cubic root of 2756840 is about 140.2180276275.

The spelling of 2756840 in words is "two million, seven hundred fifty-six thousand, eight hundred forty".