638784654 has 8 divisors (see below), whose sum is σ = 1277569320. Its totient is φ = 212928216.

The previous prime is 638784649. The next prime is 638784659. The reversal of 638784654 is 456487836.

It is an interprime number because it is at equal distance from previous prime (638784649) and next prime (638784659).

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

638784654 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 638784597 and 638784606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638784659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53232049 + ... + 53232060.

It is an arithmetic number, because the mean of its divisors is an integer number (159696165).

Almost surely, 2^638784654 is an apocalyptic number.

638784654 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

638784654 is a wasteful number, since it uses less digits than its factorization.

638784654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106464114.

The product of its digits is 3870720, while the sum is 51.

The square root of 638784654 is about 25274.1894825531. The cubic root of 638784654 is about 861.2280337729.

The spelling of 638784654 in words is "six hundred thirty-eight million, seven hundred eighty-four thousand, six hundred fifty-four".