638770822 has 8 divisors (see below), whose sum is σ = 969700536. Its totient is φ = 315537312.

The previous prime is 638770817. The next prime is 638770837. The reversal of 638770822 is 228077836.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1923843 + ... + 1924174.

It is an arithmetic number, because the mean of its divisors is an integer number (121212567).

Almost surely, 2^638770822 is an apocalyptic number.

638770822 is a deficient number, since it is larger than the sum of its proper divisors (330929714).

638770822 is a wasteful number, since it uses less digits than its factorization.

638770822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3848102.

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 638770822 is about 25273.9158422275. The cubic root of 638770822 is about 861.2218174932.

The spelling of 638770822 in words is "six hundred thirty-eight million, seven hundred seventy thousand, eight hundred twenty-two".