638620326467560 has 32 divisors (see below), whose sum is σ = 1436934899930400. Its totient is φ = 255441167853120.

The previous prime is 638620326467507. The next prime is 638620326467567. The reversal of 638620326467560 is 65764623026836.

It is a junction number, because it is equal to n+sod(n) for n = 638620326467492 and 638620326467501.

It is not an unprimeable number, because it can be changed into a prime (638620326467567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216099450 + ... + 219034729.

It is an arithmetic number, because the mean of its divisors is an integer number (44904215622825).

Almost surely, 2^{638620326467560} is an apocalyptic number.

It is an amenable number.

638620326467560 is an abundant number, since it is smaller than the sum of its proper divisors (798314573462840).

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

638620326467560 is a wasteful number, since it uses less digits than its factorization.

638620326467560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435170881 (or 435170877 counting only the distinct ones).

The product of its (nonzero) digits is 313528320, while the sum is 64.

The spelling of 638620326467560 in words is "six hundred thirty-eight trillion, six hundred twenty billion, three hundred twenty-six million, four hundred sixty-seven thousand, five hundred sixty".