638228074 has 8 divisors (see below), whose sum is σ = 1044373248. Its totient is φ = 290103660.

The previous prime is 638228057. The next prime is 638228117. The reversal of 638228074 is 470822836.

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

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 3 ways as a sum of consecutive naturals, for example, 14505162 + ... + 14505205.

It is an arithmetic number, because the mean of its divisors is an integer number (130546656).

Almost surely, 2^638228074 is an apocalyptic number.

638228074 is a deficient number, since it is larger than the sum of its proper divisors (406145174).

638228074 is a wasteful number, since it uses less digits than its factorization.

638228074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29010380.

The product of its (nonzero) digits is 129024, while the sum is 40.

The square root of 638228074 is about 25263.1762452784. The cubic root of 638228074 is about 860.9778286466.

The spelling of 638228074 in words is "six hundred thirty-eight million, two hundred twenty-eight thousand, seventy-four".