638650074 has 8 divisors (see below), whose sum is σ = 1277300160. Its totient is φ = 212883356.

The previous prime is 638650013. The next prime is 638650079. The reversal of 638650074 is 470056836.

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

638650074 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (638650079) 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, 53220834 + ... + 53220845.

It is an arithmetic number, because the mean of its divisors is an integer number (159662520).

Almost surely, 2^638650074 is an apocalyptic number.

638650074 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.

638650074 is a wasteful number, since it uses less digits than its factorization.

638650074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106441684.

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 638650074 is about 25271.5269423911. The cubic root of 638650074 is about 861.1675479693.

The spelling of 638650074 in words is "six hundred thirty-eight million, six hundred fifty thousand, seventy-four".