638241970 has 8 divisors (see below), whose sum is σ = 1148835564. Its totient is φ = 255296784.

The previous prime is 638241959. The next prime is 638242001. The reversal of 638241970 is 79142836.

It can be written as a sum of positive squares in 2 ways, for example, as 638219169 + 22801 = 25263^2 + 151^2 .

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, 31912089 + ... + 31912108.

Almost surely, 2^638241970 is an apocalyptic number.

638241970 is a deficient number, since it is larger than the sum of its proper divisors (510593594).

638241970 is a wasteful number, since it uses less digits than its factorization.

638241970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63824204.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 638241970 is about 25263.4512685817. The cubic root of 638241970 is about 860.9840772284.

The spelling of 638241970 in words is "six hundred thirty-eight million, two hundred forty-one thousand, nine hundred seventy".