63946540 has 48 divisors (see below), whose sum is σ = 155598912. Its totient is φ = 21620736.

The previous prime is 63946529. The next prime is 63946541. The reversal of 63946540 is 4564936.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 63946540.

It is not an unprimeable number, because it can be changed into a prime (63946541) 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, 7092 + ... + 13348.

It is an arithmetic number, because the mean of its divisors is an integer number (3241644).

Almost surely, 2^63946540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63946540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77799456).

63946540 is an abundant number, since it is smaller than the sum of its proper divisors (91652372).

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

63946540 is a wasteful number, since it uses less digits than its factorization.

63946540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6346 (or 6344 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 63946540 is about 7996.6580519615. The cubic root of 63946540 is about 399.8885939746. Note that the first 3 decimals are identical.

The spelling of 63946540 in words is "sixty-three million, nine hundred forty-six thousand, five hundred forty".