408856797822 has 256 divisors, whose sum is σ = 985454346240. Its totient is φ = 111788899200.

The previous prime is 408856797803. The next prime is 408856797829. The reversal of 408856797822 is 228797658804.

It is a super-2 number, since 2×408856797822² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408856797829) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 324746629 + ... + 324747887.

It is an arithmetic number, because the mean of its divisors is an integer number (3849431040).

Almost surely, 2^408856797822 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 408856797822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (492727173120).

408856797822 is an abundant number, since it is smaller than the sum of its proper divisors (576597548418).

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

408856797822 is a wasteful number, since it uses less digits than its factorization.

408856797822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499.

The product of its (nonzero) digits is 108380160, while the sum is 66.

The spelling of 408856797822 in words is "four hundred eight billion, eight hundred fifty-six million, seven hundred ninety-seven thousand, eight hundred twenty-two".