25278778 has 48 divisors (see below), whose sum is σ = 47661120. Its totient is φ = 9821952.

The previous prime is 25278767. The next prime is 25278811. The reversal of 25278778 is 87787252.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 223650 + ... + 223762.

It is an arithmetic number, because the mean of its divisors is an integer number (992940).

Almost surely, 2^25278778 is an apocalyptic number.

25278778 is a deficient number, since it is larger than the sum of its proper divisors (22382342).

25278778 is a wasteful number, since it uses less digits than its factorization.

25278778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 170 counting only the distinct ones).

The product of its digits is 439040, while the sum is 46.

The square root of 25278778 is about 5027.8005131469. The cubic root of 25278778 is about 293.4846278179.

The spelling of 25278778 in words is "twenty-five million, two hundred seventy-eight thousand, seven hundred seventy-eight".