638807886254 has 8 divisors (see below), whose sum is σ = 958337223480. Its totient is φ = 319362145096.

The previous prime is 638807886251. The next prime is 638807886287. The reversal of 638807886254 is 452688708836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638807886251) 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 3 ways as a sum of consecutive naturals, for example, 20879909 + ... + 20910480.

It is an arithmetic number, because the mean of its divisors is an integer number (119792152935).

Almost surely, 2^638807886254 is an apocalyptic number.

638807886254 is a deficient number, since it is larger than the sum of its proper divisors (319529337226).

638807886254 is a wasteful number, since it uses less digits than its factorization.

638807886254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41798034.

The product of its (nonzero) digits is 123863040, while the sum is 65.

The spelling of 638807886254 in words is "six hundred thirty-eight billion, eight hundred seven million, eight hundred eighty-six thousand, two hundred fifty-four".