25187778 has 96 divisors (see below), whose sum is σ = 72109440. Its totient is φ = 6151680.

The previous prime is 25187777. The next prime is 25187797. The reversal of 25187778 is 87778152.

It is not an unprimeable number, because it can be changed into a prime (25187777) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23028 + ... + 24096.

It is an arithmetic number, because the mean of its divisors is an integer number (751140).

Almost surely, 2^25187778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25187778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36054720).

25187778 is an abundant number, since it is smaller than the sum of its proper divisors (46921662).

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

25187778 is a wasteful number, since it uses less digits than its factorization.

25187778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112 (or 1109 counting only the distinct ones).

The product of its digits is 219520, while the sum is 45.

The square root of 25187778 is about 5018.7426712275. The cubic root of 25187778 is about 293.1320367679.

It can be divided in two parts, 2518 and 7778, that added together give a triangular number (10296 = T₁₄₃).

The spelling of 25187778 in words is "twenty-five million, one hundred eighty-seven thousand, seven hundred seventy-eight".