64520225 has 48 divisors (see below), whose sum is σ = 100934016. Its totient is φ = 40075200.

The previous prime is 64520189. The next prime is 64520231. The reversal of 64520225 is 52202546.

It is not a de Polignac number, because 64520225 - 2⁶ = 64520161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 64520194 and 64520203.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 232787 + ... + 233063.

It is an arithmetic number, because the mean of its divisors is an integer number (2102792).

Almost surely, 2^64520225 is an apocalyptic number.

It is an amenable number.

64520225 is a deficient number, since it is larger than the sum of its proper divisors (36413791).

64520225 is a wasteful number, since it uses less digits than its factorization.

64520225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327 (or 300 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 64520225 is about 8032.4482569140. The cubic root of 64520225 is about 401.0808787056.

The spelling of 64520225 in words is "sixty-four million, five hundred twenty thousand, two hundred twenty-five".