63957749 has 4 divisors (see below), whose sum is σ = 63997740. Its totient is φ = 63917760.

The previous prime is 63957721. The next prime is 63957763. The reversal of 63957749 is 94775936.

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 36844900 + 27112849 = 6070^2 + 5207^2 .

It is a cyclic number.

It is not a de Polignac number, because 63957749 - 2²⁰ = 62909173 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 = 63957697 and 63957706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63957149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17492 + ... + 20829.

It is an arithmetic number, because the mean of its divisors is an integer number (15999435).

Almost surely, 2^63957749 is an apocalyptic number.

It is an amenable number.

63957749 is a deficient number, since it is larger than the sum of its proper divisors (39991).

63957749 is a wasteful number, since it uses less digits than its factorization.

63957749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39990.

The product of its digits is 1428840, while the sum is 50.

The square root of 63957749 is about 7997.3588765292. The cubic root of 63957749 is about 399.9119577061.

The spelling of 63957749 in words is "sixty-three million, nine hundred fifty-seven thousand, seven hundred forty-nine".