64191265 has 4 divisors (see below), whose sum is σ = 77029524. Its totient is φ = 51353008.

The previous prime is 64191241. The next prime is 64191277. The reversal of 64191265 is 56219146.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14868736 + 49322529 = 3856^2 + 7023^2 .

It is a cyclic number.

It is not a de Polignac number, because 64191265 - 2¹¹ = 64189217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64191265.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6419122 + ... + 6419131.

It is an arithmetic number, because the mean of its divisors is an integer number (19257381).

Almost surely, 2^64191265 is an apocalyptic number.

It is an amenable number.

64191265 is a deficient number, since it is larger than the sum of its proper divisors (12838259).

64191265 is a wasteful number, since it uses less digits than its factorization.

64191265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12838258.

The product of its digits is 12960, while the sum is 34.

The square root of 64191265 is about 8011.9451445950. The cubic root of 64191265 is about 400.3980724644.

The spelling of 64191265 in words is "sixty-four million, one hundred ninety-one thousand, two hundred sixty-five".