2556780 has 48 divisors (see below), whose sum is σ = 7332864. Its totient is φ = 665280.

The previous prime is 2556761. The next prime is 2556791. The reversal of 2556780 is 876552.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2085 + ... + 3075.

It is an arithmetic number, because the mean of its divisors is an integer number (152768).

2^2556780 is an apocalyptic number.

2556780 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 2556780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3666432).

2556780 is an abundant number, since it is smaller than the sum of its proper divisors (4776084).

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

2556780 is a wasteful number, since it uses less digits than its factorization.

2556780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046 (or 1044 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 2556780 is about 1598.9934333824. The cubic root of 2556780 is about 136.7406962266.

The spelling of 2556780 in words is "two million, five hundred fifty-six thousand, seven hundred eighty".