64378225 has 6 divisors (see below), whose sum is σ = 79829030. Its totient is φ = 51502560.

The previous prime is 64378183. The next prime is 64378277. The reversal of 64378225 is 52287346.

It can be written as a sum of positive squares in 3 ways, for example, as 18558864 + 45819361 = 4308^2 + 6769^2 .

It is not a de Polignac number, because 64378225 - 2¹¹ = 64376177 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1287540 + ... + 1287589.

Almost surely, 2^64378225 is an apocalyptic number.

It is an amenable number.

64378225 is a deficient number, since it is larger than the sum of its proper divisors (15450805).

64378225 is a wasteful number, since it uses less digits than its factorization.

64378225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2575139 (or 2575134 counting only the distinct ones).

The product of its digits is 80640, while the sum is 37.

The square root of 64378225 is about 8023.6042399909. The cubic root of 64378225 is about 400.7864215894.

It can be divided in two parts, 64 and 378225, that multiplied together give a square (24206400 = 4920²).

The spelling of 64378225 in words is "sixty-four million, three hundred seventy-eight thousand, two hundred twenty-five".