638147520000 has 600 divisors, whose sum is σ = 2355413232744. Its totient is φ = 166182912000.

The previous prime is 638147519923. The next prime is 638147520007. The reversal of 638147520000 is 25741836.

638147520000 is a `hidden beast` number, since 6 + 381 + 4 + 75 + 200 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (600).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638147520007) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 123837424 + ... + 123842576.

Almost surely, 2^638147520000 is an apocalyptic number.

638147520000 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 638147520000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1177706616372).

638147520000 is an abundant number, since it is smaller than the sum of its proper divisors (1717265712744).

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

638147520000 is an equidigital number, since it uses as much as digits as its factorization.

638147520000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5240 (or 5206 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The spelling of 638147520000 in words is "six hundred thirty-eight billion, one hundred forty-seven million, five hundred twenty thousand".