2561380 has 24 divisors (see below), whose sum is σ = 5447232. Its totient is φ = 1011552.

The previous prime is 2561341. The next prime is 2561387. The reversal of 2561380 is 831652.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2561387) 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, 889 + ... + 2431.

It is an arithmetic number, because the mean of its divisors is an integer number (226968).

2^2561380 is an apocalyptic number.

2561380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2561380 is an abundant number, since it is smaller than the sum of its proper divisors (2885852).

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

2561380 is a wasteful number, since it uses less digits than its factorization.

2561380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635 (or 1633 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2561380 is about 1600.4311918980. The cubic root of 2561380 is about 136.8226522228.

The spelling of 2561380 in words is "two million, five hundred sixty-one thousand, three hundred eighty".