63909457920 has 1664 divisors, whose sum is σ = 301953024000. Its totient is φ = 12421693440.

The previous prime is 63909457907. The next prime is 63909457951. The reversal of 63909457920 is 2975490936.

63909457920 is a `hidden beast` number, since 63 + 9 + 0 + 9 + 4 + 579 + 2 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 808980441 + ... + 808980519.

Almost surely, 2^63909457920 is an apocalyptic number.

63909457920 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 63909457920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150976512000).

63909457920 is an abundant number, since it is smaller than the sum of its proper divisors (238043566080).

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

63909457920 is a wasteful number, since it uses less digits than its factorization.

63909457920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 3674160, while the sum is 54.

The spelling of 63909457920 in words is "sixty-three billion, nine hundred nine million, four hundred fifty-seven thousand, nine hundred twenty".