406722778368 has 108 divisors (see below), whose sum is σ = 1121091386688. Its totient is φ = 130899077120.

The previous prime is 406722778349. The next prime is 406722778369. The reversal of 406722778368 is 863877227604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406722778369) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 331033 + ... + 960743.

Almost surely, 2^406722778368 is an apocalyptic number.

406722778368 is a gapful number since it is divisible by the number (48) 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 406722778368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (560545693344).

406722778368 is an abundant number, since it is smaller than the sum of its proper divisors (714368608320).

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

406722778368 is an equidigital number, since it uses as much as digits as its factorization.

406722778368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629788 (or 629745 counting only the distinct ones).

The product of its (nonzero) digits is 37933056, while the sum is 60.

The spelling of 406722778368 in words is "four hundred six billion, seven hundred twenty-two million, seven hundred seventy-eight thousand, three hundred sixty-eight".