638770632 has 32 divisors (see below), whose sum is σ = 1597596000. Its totient is φ = 212834304.

The previous prime is 638770621. The next prime is 638770637. The reversal of 638770632 is 236077836.

It is not an unprimeable number, because it can be changed into a prime (638770637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79119 + ... + 86817.

It is an arithmetic number, because the mean of its divisors is an integer number (49924875).

Almost surely, 2^638770632 is an apocalyptic number.

It is an amenable number.

638770632 is an abundant number, since it is smaller than the sum of its proper divisors (958825368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638770632 is a wasteful number, since it uses less digits than its factorization.

638770632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11165 (or 11161 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 42.

The square root of 638770632 is about 25273.9120834112. The cubic root of 638770632 is about 861.2217321042.

The spelling of 638770632 in words is "six hundred thirty-eight million, seven hundred seventy thousand, six hundred thirty-two".