64763969 has 4 divisors (see below), whose sum is σ = 66343620. Its totient is φ = 63184320.

The previous prime is 64763903. The next prime is 64763971. The reversal of 64763969 is 96936746.

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 30658369 + 34105600 = 5537^2 + 5840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64763969 is a prime.

It is a super-2 number, since 2×64763969² = 8388743361265922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64763669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 789764 + ... + 789845.

It is an arithmetic number, because the mean of its divisors is an integer number (16585905).

Almost surely, 2^64763969 is an apocalyptic number.

It is an amenable number.

64763969 is a deficient number, since it is larger than the sum of its proper divisors (1579651).

64763969 is a wasteful number, since it uses less digits than its factorization.

64763969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1579650.

The product of its digits is 1469664, while the sum is 50.

The square root of 64763969 is about 8047.6064143322. The cubic root of 64763969 is about 401.5853107574.

The spelling of 64763969 in words is "sixty-four million, seven hundred sixty-three thousand, nine hundred sixty-nine".