25249778 has 16 divisors (see below), whose sum is σ = 39312000. Its totient is φ = 12148752.

The previous prime is 25249771. The next prime is 25249781. The reversal of 25249778 is 87794252.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25249771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23783 + ... + 24821.

It is an arithmetic number, because the mean of its divisors is an integer number (2457000).

Almost surely, 2^25249778 is an apocalyptic number.

25249778 is a deficient number, since it is larger than the sum of its proper divisors (14062222).

25249778 is a wasteful number, since it uses less digits than its factorization.

25249778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1489.

The product of its digits is 282240, while the sum is 44.

The square root of 25249778 is about 5024.9157206863. The cubic root of 25249778 is about 293.3723556328.

The spelling of 25249778 in words is "twenty-five million, two hundred forty-nine thousand, seven hundred seventy-eight".