638014646 has 4 divisors (see below), whose sum is σ = 957021972. Its totient is φ = 319007322.

The previous prime is 638014639. The next prime is 638014679. The reversal of 638014646 is 646410836.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159503660 + ... + 159503663.

It is an arithmetic number, because the mean of its divisors is an integer number (239255493).

Almost surely, 2^638014646 is an apocalyptic number.

638014646 is a deficient number, since it is larger than the sum of its proper divisors (319007326).

638014646 is a wasteful number, since it uses less digits than its factorization.

638014646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319007325.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 638014646 is about 25258.9517993127. The cubic root of 638014646 is about 860.8818455801.

The spelling of 638014646 in words is "six hundred thirty-eight million, fourteen thousand, six hundred forty-six".