63855428 has 72 divisors (see below), whose sum is σ = 147470400. Its totient is φ = 23913792.

The previous prime is 63855427. The next prime is 63855437. The reversal of 63855428 is 82455836.

It is not an unprimeable number, because it can be changed into a prime (63855427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47753 + ... + 49071.

It is an arithmetic number, because the mean of its divisors is an integer number (2048200).

Almost surely, 2^63855428 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 63855428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73735200).

63855428 is an abundant number, since it is smaller than the sum of its proper divisors (83614972).

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

63855428 is a wasteful number, since it uses less digits than its factorization.

63855428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369 (or 1360 counting only the distinct ones).

The product of its digits is 230400, while the sum is 41.

The square root of 63855428 is about 7990.9591414298. The cubic root of 63855428 is about 399.6985812572.

The spelling of 63855428 in words is "sixty-three million, eight hundred fifty-five thousand, four hundred twenty-eight".