638620546 has 16 divisors (see below), whose sum is σ = 966813408. Its totient is φ = 316357600.

The previous prime is 638620531. The next prime is 638620559. The reversal of 638620546 is 645026836.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 638620499 and 638620508.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197781 + ... + 200983.

It is an arithmetic number, because the mean of its divisors is an integer number (60425838).

Almost surely, 2^638620546 is an apocalyptic number.

638620546 is a deficient number, since it is larger than the sum of its proper divisors (328192862).

638620546 is a wasteful number, since it uses less digits than its factorization.

638620546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4097.

The product of its (nonzero) digits is 207360, while the sum is 40.

The square root of 638620546 is about 25270.9427208405. The cubic root of 638620546 is about 861.1542757314.

The spelling of 638620546 in words is "six hundred thirty-eight million, six hundred twenty thousand, five hundred forty-six".