63945409 has 8 divisors (see below), whose sum is σ = 69837120. Its totient is φ = 58066800.

The previous prime is 63945391. The next prime is 63945433. The reversal of 63945409 is 90454936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 63945409 - 2²¹ = 61848257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63945209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8932 + ... + 14410.

It is an arithmetic number, because the mean of its divisors is an integer number (8729640).

Almost surely, 2^63945409 is an apocalyptic number.

It is an amenable number.

63945409 is a deficient number, since it is larger than the sum of its proper divisors (5891711).

63945409 is a wasteful number, since it uses less digits than its factorization.

63945409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6551.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 63945409 is about 7996.5873346072. The cubic root of 63945409 is about 399.8862363977.

The spelling of 63945409 in words is "sixty-three million, nine hundred forty-five thousand, four hundred nine".