638654005847 has 32 divisors (see below), whose sum is σ = 761699495424. Its totient is φ = 527799888000.

The previous prime is 638654005831. The next prime is 638654005903. The reversal of 638654005847 is 748500456836.

It is not a de Polignac number, because 638654005847 - 2⁴ = 638654005831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 638654005792 and 638654005801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638654005147) 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, 58927313 + ... + 58938149.

It is an arithmetic number, because the mean of its divisors is an integer number (23803109232).

Almost surely, 2^638654005847 is an apocalyptic number.

638654005847 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

638654005847 is a deficient number, since it is larger than the sum of its proper divisors (123045489577).

638654005847 is a wasteful number, since it uses less digits than its factorization.

638654005847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17079.

The product of its (nonzero) digits is 19353600, while the sum is 56.

The spelling of 638654005847 in words is "six hundred thirty-eight billion, six hundred fifty-four million, five thousand, eight hundred forty-seven".