25782778 has 32 divisors (see below), whose sum is σ = 47222784. Its totient is φ = 10305792.

The previous prime is 25782773. The next prime is 25782787. The reversal of 25782778 is 87728752.

It is not an unprimeable number, because it can be changed into a prime (25782773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29800 + ... + 30652.

It is an arithmetic number, because the mean of its divisors is an integer number (1475712).

Almost surely, 2^25782778 is an apocalyptic number.

25782778 is a deficient number, since it is larger than the sum of its proper divisors (21440006).

25782778 is a wasteful number, since it uses less digits than its factorization.

25782778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006.

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

The square root of 25782778 is about 5077.6744677066. The cubic root of 25782778 is about 295.4222737368.

It can be divided in two parts, 2578 and 2778, that added together give a triangular number (5356 = T₁₀₃).

The spelling of 25782778 in words is "twenty-five million, seven hundred eighty-two thousand, seven hundred seventy-eight".