8678640553 has 4 divisors (see below), whose sum is σ = 9467607888. Its totient is φ = 7889673220.

The previous prime is 8678640547. The next prime is 8678640563. The reversal of 8678640553 is 3550468768.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 8678640553 - 2⁹ = 8678640041 is a prime.

It is a super-2 number, since 2×8678640553² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8678640553.

It is not an unprimeable number, because it can be changed into a prime (8678640563) 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, 394483651 + ... + 394483672.

It is an arithmetic number, because the mean of its divisors is an integer number (2366901972).

Almost surely, 2^8678640553 is an apocalyptic number.

It is an amenable number.

8678640553 is a deficient number, since it is larger than the sum of its proper divisors (788967335).

8678640553 is a wasteful number, since it uses less digits than its factorization.

8678640553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788967334.

The product of its (nonzero) digits is 4838400, while the sum is 52.

The square root of 8678640553 is about 93159.2215134927. The cubic root of 8678640553 is about 2055.0255878163.

The spelling of 8678640553 in words is "eight billion, six hundred seventy-eight million, six hundred forty thousand, five hundred fifty-three".