63218820 has 72 divisors (see below), whose sum is σ = 205922304. Its totient is φ = 14449344.

The previous prime is 63218797. The next prime is 63218821. The reversal of 63218820 is 2881236.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (63218821) 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, 7812 + ... + 13691.

It is an arithmetic number, because the mean of its divisors is an integer number (2860032).

Almost surely, 2^63218820 is an apocalyptic number.

63218820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

63218820 is an abundant number, since it is smaller than the sum of its proper divisors (142703484).

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

63218820 is a wasteful number, since it uses less digits than its factorization.

63218820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21529 (or 21520 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 63218820 is about 7951.0263488433. The cubic root of 63218820 is about 398.3658748452.

The spelling of 63218820 in words is "sixty-three million, two hundred eighteen thousand, eight hundred twenty".