638835074 has 8 divisors (see below), whose sum is σ = 999915840. Its totient is φ = 305529796.

The previous prime is 638835049. The next prime is 638835107. The reversal of 638835074 is 470538836.

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

It is a super-2 number, since 2×638835074² = 816220503545170952, which contains 22 as substring.

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, 6943814 + ... + 6943905.

It is an arithmetic number, because the mean of its divisors is an integer number (124989480).

Almost surely, 2^638835074 is an apocalyptic number.

638835074 is a deficient number, since it is larger than the sum of its proper divisors (361080766).

638835074 is a wasteful number, since it uses less digits than its factorization.

638835074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13887744.

The product of its (nonzero) digits is 483840, while the sum is 44.

The square root of 638835074 is about 25275.1869231466. The cubic root of 638835074 is about 861.2506924132.

The spelling of 638835074 in words is "six hundred thirty-eight million, eight hundred thirty-five thousand, seventy-four".