63509478 has 16 divisors (see below), whose sum is σ = 131399280. Its totient is φ = 20439776.

The previous prime is 63509477. The next prime is 63509513. The reversal of 63509478 is 87490536.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63509477) 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, 182325 + ... + 182672.

It is an arithmetic number, because the mean of its divisors is an integer number (8212455).

Almost surely, 2^63509478 is an apocalyptic number.

63509478 is an abundant number, since it is smaller than the sum of its proper divisors (67889802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63509478 is a wasteful number, since it uses less digits than its factorization.

63509478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365031.

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 63509478 is about 7969.2834056771. The cubic root of 63509478 is about 398.9754571873.

The spelling of 63509478 in words is "sixty-three million, five hundred nine thousand, four hundred seventy-eight".