8420815403440 has 80 divisors (see below), whose sum is σ = 21360596825376. Its totient is φ = 3061778227200.

The previous prime is 8420815403419. The next prime is 8420815403491. The reversal of 8420815403440 is 443045180248.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7558144 + ... + 8600416.

Almost surely, 2^{8420815403440} is an apocalyptic number.

8420815403440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8420815403440 is an abundant number, since it is smaller than the sum of its proper divisors (12939781421936).

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

8420815403440 is a wasteful number, since it uses less digits than its factorization.

8420815403440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051478 (or 1051472 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 43.

The spelling of 8420815403440 in words is "eight trillion, four hundred twenty billion, eight hundred fifteen million, four hundred three thousand, four hundred forty".