2581378 has 8 divisors (see below), whose sum is σ = 4075920. Its totient is φ = 1222740.

The previous prime is 2581373. The next prime is 2581391. The reversal of 2581378 is 8731852.

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

It is not an unprimeable number, because it can be changed into a prime (2581373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33928 + ... + 34003.

It is an arithmetic number, because the mean of its divisors is an integer number (509490).

2^2581378 is an apocalyptic number.

2581378 is a deficient number, since it is larger than the sum of its proper divisors (1494542).

2581378 is a wasteful number, since it uses less digits than its factorization.

2581378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67952.

The product of its digits is 13440, while the sum is 34.

The square root of 2581378 is about 1606.6667358230. Note that the first 3 decimals coincide. The cubic root of 2581378 is about 137.1778109277.

The spelling of 2581378 in words is "two million, five hundred eighty-one thousand, three hundred seventy-eight".