8657404640 has 48 divisors (see below), whose sum is σ = 20699573328. Its totient is φ = 3421234176.

The previous prime is 8657404607. The next prime is 8657404643. The reversal of 8657404640 is 464047568.

It is a junction number, because it is equal to n+sod(n) for n = 8657404591 and 8657404600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8657404643) 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, 312677 + ... + 339236.

It is an arithmetic number, because the mean of its divisors is an integer number (431241111).

Almost surely, 2^8657404640 is an apocalyptic number.

8657404640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8657404640 is an abundant number, since it is smaller than the sum of its proper divisors (12042168688).

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

8657404640 is a wasteful number, since it uses less digits than its factorization.

8657404640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652011 (or 652003 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 44.

The square root of 8657404640 is about 93045.1752644918. The cubic root of 8657404640 is about 2053.3480598071.

The spelling of 8657404640 in words is "eight billion, six hundred fifty-seven million, four hundred four thousand, six hundred forty".