25430778 has 96 divisors (see below), whose sum is σ = 62674560. Its totient is φ = 7413120.

The previous prime is 25430777. The next prime is 25430789. The reversal of 25430778 is 87703452.

It is not an unprimeable number, because it can be changed into a prime (25430773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 416868 + ... + 416928.

It is an arithmetic number, because the mean of its divisors is an integer number (652860).

Almost surely, 2^25430778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25430778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31337280).

25430778 is an abundant number, since it is smaller than the sum of its proper divisors (37243782).

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

25430778 is a wasteful number, since it uses less digits than its factorization.

25430778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 25430778 is about 5042.8938120885. The cubic root of 25430778 is about 294.0716887516.

The spelling of 25430778 in words is "twenty-five million, four hundred thirty thousand, seven hundred seventy-eight".