638384070 has 16 divisors (see below), whose sum is σ = 1532121840. Its totient is φ = 170235744.

The previous prime is 638384039. The next prime is 638384077. The reversal of 638384070 is 70483836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638384077) 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, 10639705 + ... + 10639764.

It is an arithmetic number, because the mean of its divisors is an integer number (95757615).

Almost surely, 2^638384070 is an apocalyptic number.

638384070 is an abundant number, since it is smaller than the sum of its proper divisors (893737770).

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

638384070 is a wasteful number, since it uses less digits than its factorization.

638384070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21279479.

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 638384070 is about 25266.2634752351. The cubic root of 638384070 is about 861.0479697981.

The spelling of 638384070 in words is "six hundred thirty-eight million, three hundred eighty-four thousand, seventy".