8672320638 has 24 divisors (see below), whose sum is σ = 18842382000. Its totient is φ = 2882719104.

The previous prime is 8672320621. The next prime is 8672320663. The reversal of 8672320638 is 8360232768.

8672320638 is a `hidden beast` number, since 8 + 6 + 7 + 2 + 3 + 2 + 0 + 638 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 8672320593 and 8672320602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 664563 + ... + 677486.

It is an arithmetic number, because the mean of its divisors is an integer number (785099250).

Almost surely, 2^8672320638 is an apocalyptic number.

8672320638 is an abundant number, since it is smaller than the sum of its proper divisors (10170061362).

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

8672320638 is a wasteful number, since it uses less digits than its factorization.

8672320638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342416 (or 1342413 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The square root of 8672320638 is about 93125.2953713437. The cubic root of 8672320638 is about 2054.5266332923.

The spelling of 8672320638 in words is "eight billion, six hundred seventy-two million, three hundred twenty thousand, six hundred thirty-eight".