63509945 has 16 divisors (see below), whose sum is σ = 78691008. Its totient is φ = 49170240.

The previous prime is 63509921. The next prime is 63509947. The reversal of 63509945 is 54990536.

It is not a de Polignac number, because 63509945 - 2⁶ = 63509881 is a prime.

It is a super-2 number, since 2×63509945² = 8067026227806050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63509947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38222 + ... + 39848.

It is an arithmetic number, because the mean of its divisors is an integer number (4918188).

Almost surely, 2^63509945 is an apocalyptic number.

It is an amenable number.

63509945 is a deficient number, since it is larger than the sum of its proper divisors (15181063).

63509945 is a wasteful number, since it uses less digits than its factorization.

63509945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1880.

The product of its (nonzero) digits is 145800, while the sum is 41.

The square root of 63509945 is about 7969.3127056227. The cubic root of 63509945 is about 398.9764351047.

The spelling of 63509945 in words is "sixty-three million, five hundred nine thousand, nine hundred forty-five".