8638109457 has 8 divisors (see below), whose sum is σ = 11519426976. Its totient is φ = 5757765792.

The previous prime is 8638109437. The next prime is 8638109489. The reversal of 8638109457 is 7549018368.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8638109457 - 2¹² = 8638105361 is a prime.

It is a super-2 number, since 2×8638109457² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8638109437) 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, 222508 + ... + 258429.

It is an arithmetic number, because the mean of its divisors is an integer number (1439928372).

Almost surely, 2^8638109457 is an apocalyptic number.

It is an amenable number.

8638109457 is a deficient number, since it is larger than the sum of its proper divisors (2881317519).

8638109457 is a wasteful number, since it uses less digits than its factorization.

8638109457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486927.

The product of its (nonzero) digits is 1451520, while the sum is 51.

The square root of 8638109457 is about 92941.4302504540. The cubic root of 8638109457 is about 2051.8214592122.

The spelling of 8638109457 in words is "eight billion, six hundred thirty-eight million, one hundred nine thousand, four hundred fifty-seven".