25090778 has 4 divisors (see below), whose sum is σ = 37636170. Its totient is φ = 12545388.

The previous prime is 25090777. The next prime is 25090781. The reversal of 25090778 is 87709052.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 22819729 + 2271049 = 4777^2 + 1507^2 .

It is not an unprimeable number, because it can be changed into a prime (25090777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6272693 + ... + 6272696.

Almost surely, 2^25090778 is an apocalyptic number.

25090778 is a deficient number, since it is larger than the sum of its proper divisors (12545392).

25090778 is a wasteful number, since it uses less digits than its factorization.

25090778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12545391.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 25090778 is about 5009.0695742822. The cubic root of 25090778 is about 292.7552616233.

The spelling of 25090778 in words is "twenty-five million, ninety thousand, seven hundred seventy-eight".