638654654 has 16 divisors (see below), whose sum is σ = 1045459440. Its totient is φ = 290189760.

The previous prime is 638654647. The next prime is 638654683. The reversal of 638654654 is 456456836.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 638654599 and 638654608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111812 + ... + 117384.

It is an arithmetic number, because the mean of its divisors is an integer number (65341215).

Almost surely, 2^638654654 is an apocalyptic number.

638654654 is a deficient number, since it is larger than the sum of its proper divisors (406804786).

638654654 is a wasteful number, since it uses less digits than its factorization.

638654654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10795.

The product of its digits is 2073600, while the sum is 47.

The square root of 638654654 is about 25271.6175580433. The cubic root of 638654654 is about 861.1696065499.

The spelling of 638654654 in words is "six hundred thirty-eight million, six hundred fifty-four thousand, six hundred fifty-four".