64438265 has 16 divisors (see below), whose sum is σ = 80526096. Its totient is φ = 49459200.

The previous prime is 64438237. The next prime is 64438271. The reversal of 64438265 is 56283446.

It can be written as a sum of positive squares in 8 ways, for example, as 19855936 + 44582329 = 4456^2 + 6677^2 .

It is not a de Polignac number, because 64438265 - 2¹⁴ = 64421881 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9929 + ... + 15081.

It is an arithmetic number, because the mean of its divisors is an integer number (5032881).

Almost surely, 2^64438265 is an apocalyptic number.

It is an amenable number.

64438265 is a deficient number, since it is larger than the sum of its proper divisors (16087831).

64438265 is a wasteful number, since it uses less digits than its factorization.

64438265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5260.

The product of its digits is 138240, while the sum is 38.

The square root of 64438265 is about 8027.3448287712. The cubic root of 64438265 is about 400.9109758160.

The spelling of 64438265 in words is "sixty-four million, four hundred thirty-eight thousand, two hundred sixty-five".