63499273920 has 224 divisors, whose sum is σ = 227809958400. Its totient is φ = 16646003712.

The previous prime is 63499273897. The next prime is 63499273921. The reversal of 63499273920 is 2937299436.

63499273920 is a `hidden beast` number, since 6 + 349 + 9 + 273 + 9 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (63499273921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 447477 + ... + 572043.

Almost surely, 2^63499273920 is an apocalyptic number.

63499273920 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 63499273920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113904979200).

63499273920 is an abundant number, since it is smaller than the sum of its proper divisors (164310684480).

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

63499273920 is a wasteful number, since it uses less digits than its factorization.

63499273920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124652 (or 124636 counting only the distinct ones).

The product of its (nonzero) digits is 4408992, while the sum is 54.

The spelling of 63499273920 in words is "sixty-three billion, four hundred ninety-nine million, two hundred seventy-three thousand, nine hundred twenty".