8564420739920 has 30 divisors (see below), whose sum is σ = 19912339078398. Its totient is φ = 3425757825792.

The previous prime is 8564420739911. The next prime is 8564420739923. The reversal of 8564420739920 is 299370244658.

It can be written as a sum of positive squares in 3 ways, for example, as 6779107883584 + 1785312856336 = 2603672^2 + 1336156^2 .

It is a super-2 number, since 2×8564420739920² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8564420739920.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8564420739923) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26011844 + ... + 26339036.

Almost surely, 2^{8564420739920} is an apocalyptic number.

8564420739920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8564420739920 is an abundant number, since it is smaller than the sum of its proper divisors (11347918338478).

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

8564420739920 is an frugal number, since it uses more digits than its factorization.

8564420739920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654399 (or 327200 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 59.

The spelling of 8564420739920 in words is "eight trillion, five hundred sixty-four billion, four hundred twenty million, seven hundred thirty-nine thousand, nine hundred twenty".