638823686073 has 32 divisors (see below), whose sum is σ = 921101322240. Its totient is φ = 392446088640.

The previous prime is 638823686071. The next prime is 638823686107. The reversal of 638823686073 is 370686328836.

It is not a de Polignac number, because 638823686073 - 2¹ = 638823686071 is a prime.

It is a super-2 number, since 2×638823686073² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 638823685998 and 638823686016.

It is not an unprimeable number, because it can be changed into a prime (638823686071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7319136 + ... + 7405902.

It is an arithmetic number, because the mean of its divisors is an integer number (28784416320).

Almost surely, 2^638823686073 is an apocalyptic number.

It is an amenable number.

638823686073 is a deficient number, since it is larger than the sum of its proper divisors (282277636167).

638823686073 is a wasteful number, since it uses less digits than its factorization.

638823686073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90317.

The product of its (nonzero) digits is 41803776, while the sum is 60.

The spelling of 638823686073 in words is "six hundred thirty-eight billion, eight hundred twenty-three million, six hundred eighty-six thousand, seventy-three".