8220470640 has 160 divisors (see below), whose sum is σ = 25861011456. Its totient is φ = 2159861760.

The previous prime is 8220470639. The next prime is 8220470647. The reversal of 8220470640 is 460740228.

It is a super-2 number, since 2×8220470640² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8220470647) 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, 6308229 + ... + 6309531.

Almost surely, 2^8220470640 is an apocalyptic number.

8220470640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8220470640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12930505728).

8220470640 is an abundant number, since it is smaller than the sum of its proper divisors (17640540816).

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

8220470640 is a wasteful number, since it uses less digits than its factorization.

8220470640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1687 (or 1681 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 8220470640 is about 90666.8111273359. The cubic root of 8220470640 is about 2018.2063154680.

The spelling of 8220470640 in words is "eight billion, two hundred twenty million, four hundred seventy thousand, six hundred forty".