2561378 has 8 divisors (see below), whose sum is σ = 3859968. Its totient is φ = 1274724.

The previous prime is 2561341. The next prime is 2561387. The reversal of 2561378 is 8731652.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2426 + ... + 3317.

It is an arithmetic number, because the mean of its divisors is an integer number (482496).

2^2561378 is an apocalyptic number.

2561378 is a deficient number, since it is larger than the sum of its proper divisors (1298590).

2561378 is a wasteful number, since it uses less digits than its factorization.

2561378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5968.

The product of its digits is 10080, while the sum is 32.

The square root of 2561378 is about 1600.4305670663. The cubic root of 2561378 is about 136.8226166111.

The spelling of 2561378 in words is "two million, five hundred sixty-one thousand, three hundred seventy-eight".