63533820 has 96 divisors (see below), whose sum is σ = 212179968. Its totient is φ = 13888512.

The previous prime is 63533791. The next prime is 63533831. The reversal of 63533820 is 2833536.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6372 + ... + 12948.

It is an arithmetic number, because the mean of its divisors is an integer number (2210208).

Almost surely, 2^63533820 is an apocalyptic number.

63533820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63533820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106089984).

63533820 is an abundant number, since it is smaller than the sum of its proper divisors (148646148).

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

63533820 is a wasteful number, since it uses less digits than its factorization.

63533820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6619 (or 6617 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 63533820 is about 7970.8104983120. The cubic root of 63533820 is about 399.0264239634.

The spelling of 63533820 in words is "sixty-three million, five hundred thirty-three thousand, eight hundred twenty".