63821399040 has 704 divisors, whose sum is σ = 262178449920. Its totient is φ = 14421196800.

The previous prime is 63821399039. The next prime is 63821399053. The reversal of 63821399040 is 4099312836.

It is a happy number.

63821399040 is a `hidden beast` number, since 638 + 2 + 1 + 3 + 9 + 9 + 0 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 97735354 + ... + 97736006.

Almost surely, 2^63821399040 is an apocalyptic number.

63821399040 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 63821399040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131089224960).

63821399040 is an abundant number, since it is smaller than the sum of its proper divisors (198357050880).

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

63821399040 is a wasteful number, since it uses less digits than its factorization.

63821399040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795 (or 771 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The spelling of 63821399040 in words is "sixty-three billion, eight hundred twenty-one million, three hundred ninety-nine thousand, forty".