638250007 has 4 divisors (see below), whose sum is σ = 644569416. Its totient is φ = 631930600.

The previous prime is 638249987. The next prime is 638250049. The reversal of 638250007 is 700052836.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 638250007 - 2⁷ = 638249879 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638250077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3159553 + ... + 3159754.

It is an arithmetic number, because the mean of its divisors is an integer number (161142354).

Almost surely, 2^638250007 is an apocalyptic number.

638250007 is a deficient number, since it is larger than the sum of its proper divisors (6319409).

638250007 is a wasteful number, since it uses less digits than its factorization.

638250007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6319408.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 638250007 is about 25263.6103318587. The cubic root of 638250007 is about 860.9876911660.

The spelling of 638250007 in words is "six hundred thirty-eight million, two hundred fifty thousand, seven".