25764778 has 8 divisors (see below), whose sum is σ = 41620068. Its totient is φ = 11891424.

The previous prime is 25764773. The next prime is 25764803. The reversal of 25764778 is 87746752.

It can be written as a sum of positive squares in 2 ways, for example, as 25431849 + 332929 = 5043^2 + 577^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (25764773) 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 3 ways as a sum of consecutive naturals, for example, 495451 + ... + 495502.

Almost surely, 2^25764778 is an apocalyptic number.

25764778 is a deficient number, since it is larger than the sum of its proper divisors (15855290).

25764778 is a wasteful number, since it uses less digits than its factorization.

25764778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990968.

The product of its digits is 658560, while the sum is 46.

The square root of 25764778 is about 5075.9016932955. The cubic root of 25764778 is about 295.3535089863.

The spelling of 25764778 in words is "twenty-five million, seven hundred sixty-four thousand, seven hundred seventy-eight".