64904225 has 12 divisors (see below), whose sum is σ = 80588220. Its totient is φ = 51854400.

The previous prime is 64904221. The next prime is 64904263. The reversal of 64904225 is 52240946.

It can be written as a sum of positive squares in 6 ways, for example, as 9535744 + 55368481 = 3088^2 + 7441^2 .

It is not a de Polignac number, because 64904225 - 2² = 64904221 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 64904191 and 64904200.

It is not an unprimeable number, because it can be changed into a prime (64904221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26555 + ... + 28895.

It is an arithmetic number, because the mean of its divisors is an integer number (6715685).

Almost surely, 2^64904225 is an apocalyptic number.

It is an amenable number.

64904225 is a deficient number, since it is larger than the sum of its proper divisors (15683995).

64904225 is a wasteful number, since it uses less digits than its factorization.

64904225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3460 (or 3455 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 64904225 is about 8056.3158453477. The cubic root of 64904225 is about 401.8749992946.

The spelling of 64904225 in words is "sixty-four million, nine hundred four thousand, two hundred twenty-five".