63285721820 has 48 divisors (see below), whose sum is σ = 133548131808. Its totient is φ = 25190968320.

The previous prime is 63285721813. The next prime is 63285721861. The reversal of 63285721820 is 2812758236.

It is a super-2 number, since 2×63285721820² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11745167 + ... + 11750553.

It is an arithmetic number, because the mean of its divisors is an integer number (2782252746).

Almost surely, 2^63285721820 is an apocalyptic number.

It is an amenable number.

63285721820 is an abundant number, since it is smaller than the sum of its proper divisors (70262409988).

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

63285721820 is a wasteful number, since it uses less digits than its factorization.

63285721820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8150 (or 8148 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 44.

The spelling of 63285721820 in words is "sixty-three billion, two hundred eighty-five million, seven hundred twenty-one thousand, eight hundred twenty".