423223077640 has 128 divisors (see below), whose sum is σ = 1056408635520. Its totient is φ = 151296307200.

The previous prime is 423223077623. The next prime is 423223077653. The reversal of 423223077640 is 46770322324.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 423223077593 and 423223077602.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77752759 + ... + 77758201.

It is an arithmetic number, because the mean of its divisors is an integer number (8253192465).

Almost surely, 2^423223077640 is an apocalyptic number.

423223077640 is a gapful number since it is divisible by the number (40) 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 423223077640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (528204317760).

423223077640 is an abundant number, since it is smaller than the sum of its proper divisors (633185557880).

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

423223077640 is a wasteful number, since it uses less digits than its factorization.

423223077640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8423 (or 8419 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 40.

Adding to 423223077640 its reverse (46770322324), we get a palindrome (469993399964).

The spelling of 423223077640 in words is "four hundred twenty-three billion, two hundred twenty-three million, seventy-seven thousand, six hundred forty".