63889539840 has 1728 divisors, whose sum is σ = 290803968000. Its totient is φ = 12875563008.

The previous prime is 63889539839. The next prime is 63889539851. The reversal of 63889539840 is 4893598836.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1726744302 + ... + 1726744338.

Almost surely, 2^63889539840 is an apocalyptic number.

63889539840 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 63889539840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145401984000).

63889539840 is an abundant number, since it is smaller than the sum of its proper divisors (226914428160).

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

63889539840 is a wasteful number, since it uses less digits than its factorization.

63889539840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 63.

It can be divided in two parts, 63889 and 539840, that added together give a square (603729 = 777²).

The spelling of 63889539840 in words is "sixty-three billion, eight hundred eighty-nine million, five hundred thirty-nine thousand, eight hundred forty".