25250778 has 60 divisors (see below), whose sum is σ = 65838762. Its totient is φ = 7212240.

The previous prime is 25250777. The next prime is 25250789. The reversal of 25250778 is 87705252.

It can be written as a sum of positive squares in only one way, i.e., 24770529 + 480249 = 4977^2 + 693^2 .

It is not an unprimeable number, because it can be changed into a prime (25250777) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 6348 + ... + 9528.

Almost surely, 2^25250778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25250778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32919381).

25250778 is an abundant number, since it is smaller than the sum of its proper divisors (40587984).

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

25250778 is a wasteful number, since it uses less digits than its factorization.

25250778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3209 (or 3193 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The square root of 25250778 is about 5025.0152238575. The cubic root of 25250778 is about 293.3762285181.

The spelling of 25250778 in words is "twenty-five million, two hundred fifty thousand, seven hundred seventy-eight".