634778025 has 48 divisors (see below), whose sum is σ = 1204684800. Its totient is φ = 288912960.

The previous prime is 634778009. The next prime is 634778029. The reversal of 634778025 is 520877436.

It is not a de Polignac number, because 634778025 - 2⁴ = 634778009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (634778029) 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 in 47 ways as a sum of consecutive naturals, for example, 122946 + ... + 128004.

It is an arithmetic number, because the mean of its divisors is an integer number (25097600).

Almost surely, 2^634778025 is an apocalyptic number.

It is an amenable number.

634778025 is a deficient number, since it is larger than the sum of its proper divisors (569906775).

634778025 is a wasteful number, since it uses less digits than its factorization.

634778025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5318 (or 5313 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 42.

The square root of 634778025 is about 25194.8015471446. The cubic root of 634778025 is about 859.4236380626.

The spelling of 634778025 in words is "six hundred thirty-four million, seven hundred seventy-eight thousand, twenty-five".